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Journal articles on the topic 'Acid-alkali indicator'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

A., K. Indrayan, and S. Guleria B. "Isolation of the natural dye from the heartwood of Caesalpinia sappan and its use as a new neutralization indicator." Journal of Indian Chemical Society Vol. 78, Sep 2001 (2001): 476–78. https://doi.org/10.5281/zenodo.5902540.

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Department of Chemistry, Gurukula Kangri University, Hardwar-249 404, India <em>E-mail</em> : akindray@nde.vsnl.net.in                        <em> Fax</em> : 91-0133-416366 <em>Manuscript received 27 June 2000, revised 22 March 2001, accepted 24 March 2001</em> Solution of natural dye from heartwood of the plant <em>Caesalpinia sappan </em>in ethanol is an excellent acid-alkali indicator, capable of working in much wider range than the usual indicators phenolphthalein and methyl orange. Volumetric titrations of strong acid-strong

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2

A., K. Indrayan, Yadav Vimla, Kumar Rajeev, and K. Tyagi Pradeep. "Isolation of the natural colorant from the roots of Arnebia nobilis and its use as a new neutralization indicator." Journal of India Chemical Society Vol 81, Aug 2004 (2004): 717–20. https://doi.org/10.5281/zenodo.5830366.

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Department of Chemistry, Gurukula Kangri University, Hardwar-249 404, India <em>E-mail</em>: akindray@sancharnet.in         <em> Fax</em>: 91-1334-246366 <em>Manuscript received 27 June 2002, revised 3 March 2003. accepted 17 March 2004</em> .Solution of natural dye from the roots of the plant<em> Arnebia nobilis</em> in methanol is an excellent acid-alkali indicator capable of working in much wider range than the usual indicators phenolphthalein and methyl orange. Volumetric titrations of strong acid-strong alkali, strong acid-weak alkali and weak acid-strong alkali a

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3

Chen, Ling. "Macro Analysis Would Like to Drop Half a Drop of Solution." Advanced Materials Research 291-294 (July 2011): 3264–67. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.3264.

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By strong alkali (acid) titration strong acid (alkali), alkali (acid) titration mono-weak acid (alkali), precipitation titration and coordination titration to drop by half a drop, and settling the titration error specific terms, to illustrate the macro titration analysis would like to have drop half a drop of a solution. When strong alkali titrate strong acid or monobasic weak acid, there is no need to drop half a drop. As strong acid titrate strong alkali, there is must to drop half a drop as methyl orange for indicator. But phenolphthalein as indicator, there is doesn't need to drop half a d

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4

A., K. lndrayan. "Natural dyes as neutralization indicators-a short review." Journal of Indian Chemical Society Vol. 80, May 2003 (2003): 505–9. https://doi.org/10.5281/zenodo.5839478.

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Deparatment of Chemistry, Gurukula Kangri University, Hardwar-249 404, India <em>E-mail:</em> akindray@sancharnet.in <em>Manuscript received 12 November 2002</em> Some of the naturally occurring coloured substances are pH-sensitive giving distinctly different colours in acid and basic mediums. Some of them, like the red cabbage aqueous extract, are colour-sensitive even to the same medium pH variation also and make a very good laboratory experiment for pH determination. Anthocyanidins are among the commonly occurring natural pigments. Natural colours giving a sharp, distinct and stable colour

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5

Mukhitdinov, U., R. Sayfutdinov, M. Abdumavliyanova, and Sh Mirkamilov. "Extraction of cellulose from paulownia plants and its simple ester carboxymethyl cellulose (na-kms) technology." E3S Web of Conferences 371 (2023): 01018. http://dx.doi.org/10.1051/e3sconf/202337101018.

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In this experiment, Paulownia fiber plant is ground to 0.5-1 cm. In order to determine the optimum alkali solution concentration to extract cellulose from the raw material, the optimum degree of polymerization was determined by boiling in 25, 35, 50, 55 g/l solution. It can be seen from the table that certain properties of cellulose produced under the influence of different concentrations of alkali have different indicators. At alkaline concentration of 50 g/l, the cellulose yield was 49.6%, α-cellulose 89.5%, and the degree of polymerization was known in 1100 experiments. Ash content was a po

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6

Wang, Yujue, Yan Wang, Qian Zhang, et al. "Saline-Alkali Soil Property Improved by the Synergistic Effects of Priestia aryabhattai JL-5, Staphylococcus pseudoxylosus XW-4, Leymus chinensis and Soil Microbiota." International Journal of Molecular Sciences 24, no. 9 (2023): 7737. http://dx.doi.org/10.3390/ijms24097737.

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Two saline-alkali-tolerant bacterial strains, Priestia aryabhattai JL-5 and Staphylococcus pseudoxylosus XW-4, were isolated, with high capabilities of hydrolyzing phosphate and producing cellulase, respectively. The molecular mechanisms regulating the saline-alkali tolerance in the strain JL-5 were further investigated using transcriptome analysis. The contents of lactic acid and proline and the enzymatic activity of glutamine synthetase in the strain JL-5 were significantly increased. The properties of saline-alkali soils were significantly improved by the enhanced growth of the indicator pl

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7

Zubenko, S. O. "The simple method of vegetable oils and oleochemical products acid value determination." Catalysis and Petrochemistry, no. 31 (2021): 69–74. http://dx.doi.org/10.15407/kataliz2021.31.069.

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Acid value is one of the key technical characteristic of vegetable oils and oleochemicals, obtaining on its basis. The existing standard methods of acid value measurement are relatively complicated and have some disadvantages. There are including utilization of the significant amounts of solvents, throwing out as wastes, and necessity in special equipment for determination. Also, a special issue is visual indication of the equivalence point of indicator transfer from acid to alkali form for intensive colored oils’ samples. Visual indication of the color transfer of phenol-phthalein as indicato

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8

Zhang, Ai Li, Cai Cai Chang, and Yan Hong Jia. "Design of Formulation and Performance Research of Water-Borne Epoxy Modefied by 3-(trimethoxysilyl)propyl Methacrylate Anti-Corrosion Coatings." Applied Mechanics and Materials 713-715 (January 2015): 2644–48. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2644.

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A waterborne anticorrosive coatings was prepared with homemade organic silicone 3-(trimethoxysilyl) propyl methacrylate modified epoxy acrylate emulsion as basic material, glass flake as anticorrosive filter and titanium dioxide as pigment and other additives. The anti-acid alkali salt, AC impedance, polarization curve tests were done to evaluate the coatings’ anticorrosion properties and to optimal its formula and process. The results showed that the best formula was: glass flake 35%, particle size 80 meshes, titanium dioxide as anticorrosive pigment 18% and the emulsion with epoxy at 45% con

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9

Putri, Olivia Damayanti, Dharmi Wimi Pertiwi, and Bakti Wisnu Widjajani. "Utilization of Anthocyanin Extracted from Pletekan (Ruelliatuberosa L.) in Determination Soil pH." Journal of Tropical Horticulture 2, no. 2 (2019): 34. http://dx.doi.org/10.33089/jthort.v2i2.19.

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Pletekan (Ruelliatuberosa L.) is a flowering plant that grows wild. Pletekan has blue-purple flowers, containing the anthocyanin as its specific color. Anthocyanin is an organic material that can be used as an indicator of natural acid alkali, because the color of anthocyanin can ensure specific color changes when it reacts with materials at a certain pH as well. This research aimed to utilize anthocyanin extracted from pletekan as a determinant of soil pH. The used method was maceration extraction by soaking fresh pletekan flowers using maceration solvent (methanol acidified by HCl 1%) for 2-

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10

B., V. Shilpa* K. Nikitha N. Geethika Krishna K. Sindhu S. Neha Ch. Anusha. "Plant Extracts as Herbal Indicators." International Journal of Pharmaceutical Sciences 3, no. 3 (2025): 2465–71. https://doi.org/10.5281/zenodo.15084019.

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When the pH of the solution is altered by adding acid or alkali, indicators—which are highly specific compounds—will cause the solution's color to change. Red cabbage's actual color is blue. It will be somewhat blue after cutting it up and adding some tap water, but it will turn red when vinegar is added. This is because the color in red cabbage acts as a pH sensor. The aim of this study is to examine the possibility of using extracts of flower pigments in place of synthetic indicators. Synthetic indicators are costly, problematic in terms of supply, and hazardous chemically. An es

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11

Matinong, Andrea Marie E., Kim L. Pickering, Mark R. Waterland, Yusuf Chisti, and Richard G. Haverkamp. "Gelatin and Collagen from Sheepskin." Polymers 16, no. 11 (2024): 1563. http://dx.doi.org/10.3390/polym16111563.

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Abattoirs dispose of sheepskins as solid waste due to low price and poor demand for sheepskin leather. In principle, as an alternative to being disposed of in landfill, sheepskins can serve as a source of the protein collagen or the hydrolysis product, gelatin. In this research, sheepskins collected from abattoirs were used as a source of collagen. Three extraction methods were compared: acid extraction, acid with enzymes, and alkali extraction. The extracted material was characterized using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR), small angle X-ra

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12

Dipaningrum, Puput Kusuma, Ade Maria Ulfa, and Sudewi Mukaromah Khoirunnisa. "PENETAPAN KADAR ALKALI BEBAS PADA SABUN CUCI KRIM YANG DIJUAL DI MINI MARKET SECARA ASIDIMETRI." Jurnal Analis Farmasi 6, no. 2 (2022): 130–35. http://dx.doi.org/10.33024/jaf.v6i2.5956.

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Laundry soap cream is one PKRT (Household Health) which is used to clean equipment and to wash clothes. The main constituent component of fat and soap is alkaline, where if there is excess base does not react with the excess fat there will be alkali-free. If in the soap containing alkali-free high, it can cause skin irritations such as rough skin, flushed, sometimes there are small spots of water and cause itching. Limit allowed in the free alkali soap cream by the Indonesian National Standard 06-2048-1990 ie a maximum of 0.1%. This study aims to determine the levels of free alkaline detergent

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13

Song, Xiaoqian, Nan Yang, Yuhang Su, et al. "Suaeda glauca and Suaeda salsa Employ Different Adaptive Strategies to Cope with Saline–Alkali Environments." Agronomy 12, no. 10 (2022): 2496. http://dx.doi.org/10.3390/agronomy12102496.

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(1) Background: soil salinization has become a global problem that restricts agricultural production; thus, there is a need to explore the special survival strategies of halophytes in saline–alkali environments. (2) Methods: this study conducted a comparative analysis of the differences in metabolites and mineral elements between two indicator plants (Suaeda glauca and Suaeda salsa) in the study area. (3) Results: S. salsa leaves accumulated more total nitrogen (TN), total organic carbon (TOC), calcium (Ca), sodium (Na) and manganese (Mn). The Na/K analysis showed that S. salsa was more tolera

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14

Zhang, Rui Jie, Chang Ren Zhou, Li Hua Li, and Ming Xian Liu. "The Research on Deproteinized Techniques of Bio-Calcium Chitin." Advanced Materials Research 749 (August 2013): 160–66. http://dx.doi.org/10.4028/www.scientific.net/amr.749.160.

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0Objective :This study is to retain the biological calcium in the crab shell, stripped of protein, calcium biological chitin chitin that is retained characteristics have unique biological calcium carbonate mosaic structure. the traditional preparation of chitin commoly adopts acid to remove calcium carbonae,applys alkali to extract protein, while inorgaic calcium salts is mixed with it as a source of calcium or an enhancement.Methods :Superfine pulverizing technology is used to smash crab shell to D50, which is 8.05 μm to get different size of crab shell powder through screen separation. The p

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15

Ivashkiv, Yu A., G. Yu Nedilka, and A. R. Savchak. "STUDY OF THE QUALITY OF VEGETABLE OILS UNDER DIFFERENT STORAGE CONDITIONS." Scientific and Technical Bulletin оf State Scientific Research Control Institute of Veterinary Medical Products and Fodder Additives аnd Institute of Animal Biology 26, no. 1 (2025): 69–73. https://doi.org/10.36359/scivp.2025-26-1.08.

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The objective of this study was to evaluate the quality of vegetable oils: unrefined sunflower oil (Grade I) and hydrated soybean oil (Grade I). One of the key phases of the analysis involved determining quality indicators, including acid value (representing the total content of free fatty acids) and peroxide value (indicating the amount of primary oxidation products of fats – peroxide compounds). The oxidation degree of fats was evaluated by determining the peroxide value, titrating the released iodine with a sodium thiosulfate solution, and by measuring the acid value using the neutralizatio

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16

Li, Haoran, Tao Peng, Yunlong Zhong, et al. "pH Regulator on Digital Microfluidics with Pico-Dosing Technique." Biosensors 13, no. 11 (2023): 951. http://dx.doi.org/10.3390/bios13110951.

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Real-time pH control on-chip is a crucial factor for cell-based experiments in microfluidics, yet difficult to realize. In this paper, we present a flexible pH regulator on a digital microfluidic (DMF) platform. The pico-dosing technology, which can generate and transfer satellite droplets, is presented to deliver alkali/acid into the sample solution to change the pH value of the sample. An image analysis method based on ImageJ is developed to calculate the delivered volume and an on-chip colorimetric method is proposed to determine the pH value of the sample solution containing the acid-base

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17

Bykovsky, Nikolay Alekseevich, Timur Z. Zabirov, Inna V. Ovsyannikova, and Nadezhda F. Fanakova. "The Application of Phytotesting Method to Assess the Toxicity of Titanium Etching Effluents." Key Engineering Materials 769 (April 2018): 161–65. http://dx.doi.org/10.4028/www.scientific.net/kem.769.161.

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The article evaluates the toxicity of the spent acid etching solution (SAES) formed in production of titanium products when etched with a mixture of hydrofluoric and hydrochloric acids. The SAES contained TiF3, HF and HCl in the amount of 21.9 g/l, 1.7 g/l and 6.2 g/l, respectively. To determine the toxicity of SAES the phytotesting method was used. As a phytoecological indicator, a cress of Zabava variety was used. The experiment was carried out according to the method for determining the toxicity of drinking, ground, surface and sewage water, chemical solutions by measuring the germination i

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18

Ding, Cong-Wen, Luo-Qing Wei, and Shang-Ze Zhou. "Antibiotic Spectrum and Stability of Crude Extract of Extracellular Metabolites from Bacillus mageterium LB01-17." Asian Journal of Chemistry 33, no. 11 (2021): 2803–6. http://dx.doi.org/10.14233/ajchem.2021.23432.

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Crop pathogens including fungi and bacteria seriously affect the quality and yields of agricultural products. The purpose of this study was to detect the antibiotic spectrum of the crude extract of extracellular metabolites produced by Bacillus megaterium LB01-17 and its stability to heat, acid, alkali and ultraviolet light. The methods of mycelium growth rate and inhibitory zones were used to test the antimicrobial activity of the crude extract on 13 kinds of crop pathogenic fungi and 6 kinds of bacteria. The activity stability of the crude extract was determined under different pH values, ac

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19

MUESCHKE, NICHOLAS J., OLEG SCHILLING, DAVID L. YOUNGS, and MALCOLM J. ANDREWS. "Measurements of molecular mixing in a high-Schmidt-number Rayleigh–Taylor mixing layer." Journal of Fluid Mechanics 632 (July 27, 2009): 17–48. http://dx.doi.org/10.1017/s0022112009006132.

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Molecular mixing measurements are reported for a high-Schmidt-number (Sc~ 103), small-Atwood-number (A≈ 7.5 × 10−4) buoyancy-driven turbulent Rayleigh–Taylor (RT) mixing layer in a water channel facility. Salt was added to the top water stream to create the desired density difference. The degree of molecular mixing was measured as a function of time by monitoring a diffusion-limited chemical reaction between the two fluid streams. The pH of each stream was modified by the addition of acid or alkali such that a local neutralization reaction occurred as the two fluids molecularly mixed. The prog

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20

Pang, Yu, Zhi Li Zhong, Hua Wu Liu, and Liang Kui Rao. "Research on Fire-Resistant Fabric Properties of Basalt Fiber." Applied Mechanics and Materials 217-219 (November 2012): 1151–54. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1151.

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Fire retardant performance is an important indicator of fire-resistant fabric, and a major part of fabric protective properties, which has a great relationship with raw materials and weaving processing parameters of weaving. In this paper, basalt fiber were used to make fire-resistant fabric due to the superior properties of heat resistance, anti-oxidation, radiation, insulation of noisy and heat, filtration and high compression strength and shear strength. The fabrics of different weaves were produced on a sample loom. Then the properties, such as abrasion durability, fire resistance, reactio

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21

Abedi, Mohammad Reza, and Hassan Ali Zamani. "Construction of Eu3+Ion-Selective Electrode Based on 1,2-Diaminopropane-N,N,N',N'-tetraacetic acid." E-Journal of Chemistry 8, s1 (2011): S467—S473. http://dx.doi.org/10.1155/2011/716406.

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A new Eu3+PVC membrane electrode based on 1,2-diaminopropane-N, N,N',N'-tetraacetic acid (DAPTA) as a suitable ionophore has been prepared and studied. The electrode shows a good selectivity for Eu(III) ion with respect to most common cations including alkali, alkaline earth, transition and heavy metal ions. This electrode has a wide linear dynamic range from 1.0×10-6to 1.0×10-2M with a Nernstian slope of 19.7±0.5 mV per decade and a low detection limit of 7.2×10-7M in the pH range of 2.5–9.1, while the response time was rapid (<10 s). The practical utility of the electrodes has been demons

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22

Ambrosova, Galina, and Anastasiia Kruglikova. "Results of compact facility work with anaerobic treatment of highly concentrated runoffs." IOP Conference Series: Earth and Environmental Science 937, no. 4 (2021): 042052. http://dx.doi.org/10.1088/1755-1315/937/4/042052.

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Abstract This scientific work is devoted to the results of the local treatment facilities’ work for food enterprises sewerage. The complex under consideration is intended for the anaerobic processing of whey, formed during fermented milk production. Whey is one of the specific organic substances, which main component is lactose (sucrose). It is converted under anaerobic conditions into lactic acid, which is a metabolic dead end. The capacity can be used as a homogenizing tank, obtained in this way. In the future, it is proposed to increase the homogenizer volume to 100 m3. It is recommended to

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23

Bykovsky, Nikolay Alekseevich, Timur Zulfukarovich Zabirov, Inna Vyacheslavovna Ovsyannikova, Lyudmila Nikolaevna Puchkova, and Nadezhda Nikolaevna Fanakova. "Toxicity assessment of pickling liquors containing TiF₃, HF and HCl before and after neutralization using a phytotesting method." Samara Journal of Science 6, no. 2 (2017): 24–27. http://dx.doi.org/10.17816/snv201762104.

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The paper evaluates the toxicity of spent acid pickling liquor (SAPL) formed in the production of titanium products during its etching with a mixture of hydrofluoric and hydrochloric acids. The SAPL contained TiF₃, HF and HCl in the amounts of 21,9 g/l, 1,7 g/l and 6,2 g/l, respectively. To determine the toxicity of SAPL, a phytotesting method was used. As a phytoecological indicator, cress of Zabava variety was used. The experiment was carried out according to the procedure for determining the toxicity of drinking, ground, surface and sewage water; the toxicity of chemical solutions by measur

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24

Levytskyy, T. R., O. V. Moravskaya, G. Yu Fedor, G. Yu Nedilka, and G. V. Kushnir. "SOME QUALITY INDICATORS OF VEGETABLE OILS UNDER DIFFERENT STORAGE CONDITIONS." Scientific and Technical Bulletin оf State Scientific Research Control Institute of Veterinary Medical Products and Fodder Additives аnd Institute of Animal Biology 22, no. 1 (2021): 145–51. http://dx.doi.org/10.36359/scivp.2021-22-1.17.

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The aim of our work was to study the quality of vegetable oils - unrefined sunflower oil (grade I) and soy hydrated oil (grade I). One of the stages of the study was to determine the quality of vegetable oils - peroxide value (characterizes the amount of primary oxidation products of fats - peroxide compounds) and acid number (characterizes the total content of free fatty acids) in the samples of vegetable oils. The acid number was determined by titration (neutralization) of free fatty acids with alkali in the presence of an indicator (phenolphthalein). The peroxide number was determined by ti

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25

Gu, Shan, Li Yang, Xiaoye Liang, and Jingsong Zhou. "Utilizing Life Cycle Assessment to Optimize Processes and Identify Emission Reduction Potential in Rice Husk-Derived Nanosilica Production." Processes 13, no. 2 (2025): 483. https://doi.org/10.3390/pr13020483.

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A consistent life cycle assessment (LCA) methodology was employed to show how the type of alkali (NaOH or Na2CO3) used for extracting water glass from rice husks, as well as the type of acid (HCl, H2SO4, or HNO3) used for precipitating water glass to nanosilica, affects the environmental emissions of rice husk-derived nanosilica (RH nanosilica). Six nanosilica production scenarios were explicitly compared to determine the most environmentally friendly route. The LCA results show that under the same circumstances, the majority of the environmental emissions of sodium hydroxide (NaOH) are signif

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26

Moravska, O. V., T. R. Levytskyy, and S. O. Vovk. "Titrimetric method determination of the content of the mass part of siliciumin feed additives." Ukrainian Journal of Ecology 10, no. 1 (2020): 62–65. http://dx.doi.org/10.15421/2020_10.

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The results of the development of the method for determining the mass fraction of silicium in powder samples of feed additives by the titrimetric method are presented in the article. The implementation and validation of the method was carried out with the use of feed additive of mixed type "Mikasil" produced by LLC «Globus», Ukraine. The procedure was reproduced ten times with the determination of the mass fraction of siliciumin two parallel samples. The method is based on the precipitation of silicic acid in the form of silicium-fluoride of potassium, followed by hydrolysis with hot water in

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27

Kharate, Vrushali, Mohini Kuchekar, Minal Harde, et al. "Development of Validated Stability Indicating HPTLC Method for Estimation of Febuxostat in Bulk and Tablet Dosage Form by Using QBD Approach." INTERNATIONAL JOURNAL OF DRUG DELIVERY TECHNOLOGY 13, no. 02 (2022): 542–50. http://dx.doi.org/10.25258/ijddt.13.2.14.

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Objective: Development of a simple, reliable, time-tested, stability-focused HPTLC method for determining febuxostat (FEB) in bulk and pharmaceutical formulation.Methods: Chloroform, methanol, and formic acid (6.7:2.9:0.1v/v/v) served as the mobile phase, and precoated aluminum TLC plates served as the stationary phase. Active drug FEB was subjected to a densitometric measurement (absorbance mode at 312 nm). The present study performed a comprehensive stress test of FEBas per ICH Q1A(R2) guidelines. FEB has undergone forced degradation by acid, alkali (0.5N HCl and NaOH), oxidative (3% H2O2),

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28

Shaafi, Nur Farha, Mohammad Mubarrak Mohd Yusof, Ellianawati Ellianawati, Bambang Subali, and Muhammad Haziq Hazim Raji’e. "Investigating misconceptions about acids and bases among pre-service science teachers." Journal of Education and Learning (EduLearn) 19, no. 1 (2025): 460–77. http://dx.doi.org/10.11591/edulearn.v19i1.21803.

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This study examines prevalent misconceptions among students regarding the fundamental concepts of acids and bases, which often arise during the learning process. This study aims to pinpoint misconceptions held by pre-service science teachers in the realm of acids and bases; 117 university students from diverse educational backgrounds, enrolled in three distinct courses: Biology, Chemistry, and Physics from the Faculty of Education, participated in the study. Using a structured questionnaire, the research identified 11 misconceptions out of 26 items related to acid and base concepts among pre-s

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29

Kazbulatova, Gulfiya M., and Sergey V. Michurin. "Environmental hazard assessment of the Uluk-Bar gold deposit (Southern Urals)." Bulletin of the Tomsk Polytechnic University Geo Assets Engineering 335, no. 5 (2024): 142–57. http://dx.doi.org/10.18799/24131830/2024/5/4338.

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Relevance. Due to the maximum allowable concentrations of heavy metals and metalloids exceeding in the surface waters of the Avzyan gold region, possible sources of toxic elements are determined, which is important for combating pollution in ore areas. Aim. To assess the environmental hazard of the Ulyuk–Bar gold deposit based on the chemical and mineralogical composition of the enclosing rocks and the mobility of toxic elements in them. Materials and methods. The chemical composition of rocks was determined by X-ray fluorescence and atomic emission with inductive plasma methods, as well as us

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30

Zamani, Hassan Ali, Zynab Rafati, and Soraia Meghdadi. "Construction of Tb3+ PVC-MembraneElectrode Based on N,N’-Bis(pyrrolylmethylene)-2-aminobenzylamine." E-Journal of Chemistry 8, s1 (2011): S203—S210. http://dx.doi.org/10.1155/2011/263256.

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In this work, we report as new Tb3+-PVC membrane sensor based onN,N’-bis(pyrrolylmethylene)- 2-aminobenzylamine (PMA) as a suitable ion carrier. Poly vinylchloride (PVC)-based membrane composed of PMA with oleic acid (OA) as anionic additives and acetophenone (AP) as plasticizing solvent mediators. The Tb3+sensor exhibits a Nernstian slope of 19.7±0.4 mV per decade over the concentration range of 1.0×10-5to 1.0×10-2M and a detection limit of 4.6×10-6M of Tb3+ions. The potentiometric response of the sensor is independent of the solution pH in the range of 2.9–8.1. It has a very short response t

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31

Mittal, Susheel K., S. K. Ashok Kumar, and Harish K. Sharma. "Cerium(III)-Selective Membrane Electrode Based on Dibenzo-24-crown-8 as a Neutral Carrier." E-Journal of Chemistry 7, no. 3 (2010): 849–55. http://dx.doi.org/10.1155/2010/170798.

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Cerium(III)-selective membrane electrodes have been prepared using dibenzo-24-crown-8 (DB24C8) as an electroactive material. A membrane having a composition: DB24C8 (4.5%), plasticizer (NPOE, 62.5%) and PVC (33%) gives the best performance. It works well over a wide Ce(III) ion-concentration range of 1x10-5M to 1x10-1M with a Nernstian slope of 19.0 mV/decade and a detection limit of 3x10-5M. It has a fast response time of 20 seconds and has an average lifetime of four months. The internal solution concentration does not have a significant effect on the response of the electrode except for a c

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32

Mardiyah, Ainun, Muhammad Rio Syahputra, and Motohiro Tsuboi. "Analysis of Rare Earth Elements in Pteridophytes from the Historical Mining Area, Southwestern Japan." Sustainability 15, no. 18 (2023): 13406. http://dx.doi.org/10.3390/su151813406.

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Recent studies have shown that various fern species can accumulate REEs in the soil and may be utilized as indicator plants. Athyrium yokoscense, commonly called hebino negoza in Japan, is a pteridophyte that is used as an indicator of metal-contaminated soils in Japan. Mining and mineral processing increase the potential of mine minerals to oxidize and change their chemical form. A study on the biogeochemical behavior of REEs in the mine area needs to be conducted due to the significant use of REEs as an essential material for various applications in the world. The REE content in sediment and

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Tyagi, Sonika, Himanshu Agarwal, and Saiqa Ikram. "A polyvinylchloride-based cadmium ion-selective electrode using [Mo2(OAc)2(H2-calix[4]arene)] as an electroactive material." Water Science and Technology 62, no. 11 (2010): 2510–18. http://dx.doi.org/10.2166/wst.2010.774.

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A highly electroactive material Mo2[(OAc)2(H2-calix[4]arene)] is used as a neutral carrier for Cd2 + ions in this paper. The membrane is fabricated by using ionophore [Mo2(OAc)2(H2-calix[4]arene)]:poly(vinyl chloride) (PVC): dibutylphthalate(DBP):sodium tetraphenyl borate (NaTPB) in the ratio of 40:300:470:5 respectively and tetrahydrofuran (THF) used as a solvent. The membrane electrode performed in the concentration range of 9.9 × 10−8–1.0 × 10−1 M (2.34 × 10−5–23.64 mg/mL) having the Nernstian slope of 30.0±1.0 mV and the best detection limit was observed at 9.8 × 10−8 M (2.31 × 10−5 mg/mL)

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Zamani, Hassan Ali, Samaneh Langroodi, and Soraia Meghdadi. "Application ofN-Quinoline-2-carboxamido-8-aminoquinoline in Fabrication of a Ho(III)-PVC Membrane Sensor." E-Journal of Chemistry 8, s1 (2011): S237—S244. http://dx.doi.org/10.1155/2011/437938.

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TheN-quinoline-2-carboxamido-8-aminoquinoline (QCA) was used as a suitable ion carrier in the construction of a Ho(III) PVC-based membrane sensor. This sensor demonstrated good selectivity and sensitivity towards the holmium ion for a broad variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The proposed electrode exhibits a linear dynamic range between 1.0×10-6and 1.0×10-2M, with a near Nernstian slope of 20.4±0.3 mV per decade and a detection limit of 4.2×10-7M. The best performance was obtained with a membrane composition of 30% poly(vinyl chloride), 56% n

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Glotov, V. E. "Распространение и формирование подземных содовых вод на водосборной площади Верхней Колымы". Bulletin of the North-East Science Center, № 2 (30 червня 2023): 52–64. http://dx.doi.org/10.34078/1814-0998-2023-2-52-64.

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In the Upper Kolyma basin, mostly hydrocarbonate and sulfate waters are distributed with a predominance of alkaline earth metal cations in the composition. Hydro-carbonates with alkali metal cations (Na+ + K+), distinguished as soda, are found only in local areas in fault zones and those of granite intrusion contacts. They are the least mineralized (no more than 100 mg/dm3) in the seasonally thawed layer and river valley taliks, but even there, in separate foci at the elevation of above 1600 m, soda water springs with the mineralization exceeding 200 mg/dm3 occur. Soda waters in Cretaceous coa

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Sharma, Harish K., and Nadeem Sharma. "Potentiometric Sensor for Gadolinium(III) Ion Based on Zirconium(IV) Tungstophosphate as an Electroactive Material." E-Journal of Chemistry 6, no. 4 (2009): 1139–49. http://dx.doi.org/10.1155/2009/301016.

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A new inorganic ion exchanger has been synthesized namely Zirconium(IV) tungstophosphate [ZrWP]. The synthesized exchanger was characterized using ion exchange capacity and distribution coefficient (Kd). For further studies, exchanger with 0.35 meq/g ion-exchange capacity was selected. Electrochemical studies were carried out on the ion exchange membranes using epoxy resin as a binder. In case of ZrWP, the membrane having the composition; Zirconium(IV) tugstophosphate (40%) and epoxy resin (60%) exhibits best performance. The membrane works well over a wide range of concentration from 1×10-5to

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Ohgaki, Shinichiro, Awrapin Ketratanakul, and Uthaiphun Prasertsom. "Effect of Sunlight on Coliphages in an Oxidation Pond." Water Science and Technology 18, no. 10 (1986): 37–46. http://dx.doi.org/10.2166/wst.1986.0109.

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Escherichia coli B were used as host cells for isolation and multiplication of coliphages. The coliphages were isolated from a small canal which receives the effluent from an oxidation pond in Bangkok, Thailand, and were used as a virological indicator. Coliphages were assayed by the plaque forming technique (PFU method). The coliphage which was used in this study had no resistance to acid (pH3) and weak resistance to alkali (pH 10).The fate of coliphages in the oxidation pond was investigated by field measurement and laboratory experiments. Batch experiments showed the adsorption of coliphage

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Harish, K. Sharma, Verma Neha, and J. K. Kapoor. "Potentiometric Sensors for Pr(III) Based onN-N᾽o-Phenylene-bis(salicylideneimine) Using Epoxy Resin and PVC as Binding Materials." E-Journal of Chemistry 8, s1 (2011): S155—S164. http://dx.doi.org/10.1155/2011/358039.

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Praseodymium(III) ion selective electrodes have been prepared usingN-N᾽o-phenylene-bis(salicylideneimine) as a suitable electro-active material. Several membranes comprising of varying compositions of electro-active material with epoxy resin and polyvinylchloride (PVC) as binding materials were prepared. However the one with composition 50% Schiff᾽s base and 50% binder was found to exhibit best performance. The sensor with epoxy resin as binder presents a linear dynamic range of 1.0×10-6to 1.0×10-1M with a Nernstian slope of 19.9 mV/decade. The sensor has a quick response time. (less than 10 s

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Zhang, Shengwang, Jianwen Wang, Qian Yang, et al. "Effects of Subsurface Drainage Spacing and Organic Fertilizer Application on Alfalfa Yield, Quality, and Coastal Saline Soil." Water 16, no. 8 (2024): 1144. http://dx.doi.org/10.3390/w16081144.

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Subsurface drainage and organic fertilizer application are two important measures for improving saline–alkali soils, while the effects of different drainage spacings combined with organic fertilizer application amounts on alfalfa growth and coastal saline soil properties have seldom been evaluated. This study designed subsurface drainage pipes at four spacing distances, including 0 m (CK, without subsurface drainage), 6 m (S1), 12 m (S2), and 18 m (S3), and three organic fertilizer application amounts, including 3000 kg/ha (N1), 4500 kg/ha (N2), and 6000 kg/ha (N3), to observe the effects of d

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Марков, В. Н., М. Л. Доморощенкова, Т. Ф. Демьяненко, И. А. Лисицына, И. В. Крылова та А. В. Ефимов. "ВЛИЯНИЕ СОДЕРЖАНИЯ СВОБОДНОГО МАСЛА В ЯДРЕ ПОДСОЛНЕЧНЫХ СЕМЯН НА КАЧЕСТВЕННЫЕ ПОКАЗАТЕЛИ МАСЛА И БЕЛКА". Вестник Всероссийского научно-исследовательского института жиров, № 1-2 (12 грудня 2024): 18–23. https://doi.org/10.25812/vniig.2024.89.97.023.

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Задачей исследований являлось установление связи показателя «Относительной доли свободного масла» с изменениями в протеиновой части ядра семян наряду с изменениями в масляной части после хранения семян в модельной системе. Получены новые научные данные по окислению свободного и локализованного масел и изменениям в растворимости белковой фракции в ядре семян подсолнечника. Подтверждена прямая взаимосвязь данного показателя с показателем кислотное число локализованного масла. Экспериментально подтверждено уменьшение концентрации сырого протеина и снижение растворимости протеина в процессе хранен

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ZOZULYNETS, Viktoriia, and Oleksandr KOVALCHUK. "EFFECT OF ADDITIONAL INPUT OF Na3PO4∙12H2O ON ACID RESISTANCE INDICATORS OF HYBRID ALKALINE CEMENTS." Building constructions. Theory and Practice, no. 12 (June 27, 2022): 65–72. http://dx.doi.org/10.32347/2522-4182.12.2023.65-72.

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This work is devoted to the study of the direct influence of phosphate salt, using theexample of trisodium phosphate (Na3PO4∙12H2O), on the acid resistance index of hybrid alkaliactivated cements. After all, acid resistance is becoming an increasingly important property for cement materials due to a wide range of applications where they are exposed to aggressive acid environments, especially in the chemical and foodindustries. In addition to the above, these include sewage systems, agricultural environments, oilwells, acid rain, and much more.Conventional Portland cement binders are known to b

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Liu, Danfei, Changfan Zhang, Yumei Pu, et al. "Recent Advances in pH-Responsive Freshness Indicators Using Natural Food Colorants to Monitor Food Freshness." Foods 11, no. 13 (2022): 1884. http://dx.doi.org/10.3390/foods11131884.

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Recently, due to the enhancement in consumer awareness of food safety, considerable attention has been paid to intelligent packaging that displays the quality status of food through color changes. Natural food colorants show useful functionalities (antibacterial and antioxidant activities) and obvious color changes due to their structural changes in different acid and alkali environments, which could be applied to detect these acid and alkali environments, especially in the preparation of intelligent packaging. This review introduces the latest research on the progress of pH-responsive freshne

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Potskhveriya, M. M., V. A. Matkevich, Yu S. Goldfarb, et al. "The program of enteral correction of homeostasis disorders and its effect on intestinal permeability in acute poisoning." Transplantologiya. The Russian Journal of Transplantation 14, no. 1 (2022): 45–57. http://dx.doi.org/10.23873/2074-0506-2022-14-1-45-57.

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Background. The problem of pathologically increased permeability of the intestinal wall is actualized with the accumulation of information about the correlation of this phenomenon with complications of an inflammatory nature and multiple organ failure in critical conditions, including acute poisoning.Aim of study. To assess the effect of the program of enteral correction of homeostasis disorders on intestinal permeability in acute poisoning.Material and methods. 40 patients (67.5% of women and 32.5% of men) admitted at the Intensive Care Unit as part of the Scientific Department of Acute Poiso

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Dovholap, Serhii, Mykola Gomelya, Olena Ivanenko, Yuliia Nosachova, and Artem Martyniuk. "Environmentally safe technology of waste processing of galvanic production." Proceedings of the NTUU “Igor Sikorsky KPI”. Series: Chemical engineering, ecology and resource saving, no. 1 (March 29, 2024): 52–61. http://dx.doi.org/10.20535/2617-9741.1.2024.300987.

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It is known that waste is difficult to purify using existing reagent methods to the standards of the MPC. In addition, the formed sediments contain poorly soluble hydroxy compounds of heavy metals and gypsum, which makes it impossible to dispose of iron- and copper-containing electroplating sludges. The purpose of the study was to study the possibility of ion exchange separate and simultaneous extraction of iron and copper ions from acidic solutions of pickling and copper plating in galvanic production to obtain ferrites. In the course of research, the highly acidic cation exchange resin Dowex

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Wang, Xiaodong, Hailong Shen, and Ling Yang. "The Response of Hormones, Reactive Oxygen Species and Nitric Oxide in the Polyethylene-Glycol-Promoted, Salt–Alkali-Stress-Induced Embryo Germination of Sorbus pohuashanensis." International Journal of Molecular Sciences 25, no. 10 (2024): 5128. http://dx.doi.org/10.3390/ijms25105128.

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Polyethylene glycol can abrogate plant seed dormancy and alleviate salt–alkali stress damage to plants, but its role in embryonic dormancy abrogation and germination in Sorbus pohuashanensis is not yet clear. The mechanism by which polyethylene glycol promotes the release of embryonic dormancy may be related to the synthesis and metabolism of endogenous hormones, reactive oxygen species and reactive nitrogen. In this article, germination in indoor culture dishes was used, and the most suitable conditions for treating S. pohuashanensis embryos, with polyethylene glycol (PEG) and sodium carbonat

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Wang, Huimin, Yun Li, Yanan Yang, et al. "Physiological Mechanisms and Core Genes in Response to Saline-Alkali Stress in Foxtail Millet (Setaria italica L.)." Biomolecules 15, no. 6 (2025): 859. https://doi.org/10.3390/biom15060859.

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Soil salinization and alkalization are becoming increasingly severe in recent decades, which poses serious threats to crop production and food security in the world. Foxtail millet (Setaria italica L.) is an important cereal crop in China, and it is important to elucidate its saline-alkali tolerance mechanisms for the breeding of new saline-alkali tolerant varieties. In this study, we used 75% seawater to treat two foxtail millet varieties with different saline-alkali tolerances (JK3, saline-alkali tolerant; B175, saline-alkali sensitive) during the seedling stage, and conducted morphological,

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Chernyak, Lev. "Industrial waste as a factor of increasing the chemical resistance of ceramics." Zastita materijala 63, no. 2 (2022): 177–82. http://dx.doi.org/10.5937/zasmat2202177c.

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The possibility of the manufacturing of ceramics with equally high indicators of acid and alkali resistance is shown. The effect achieved is associated with the formation of a system of crystalline phases of anortite-hematite-cristobalite during the firing of masses created on the base of compositions of red mud and polymineral clay. Technological schemes of the production of ceramic materials from masses with the total content of 60-80% of red mud, non-ferrous metallurgy waste, which is the factor of increase of decorative and operational characteristics of production are proposed.

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Honcharov, I. V., L. A. Bodnar, and L. I. Vyshnevska. "Research on the development of quality control methods for a solid soap for treating psoriasis." News of Pharmacy 109, no. 1 (2025): 23–27. https://doi.org/10.24959/nphj.25.164.

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Products in the form of soap are a relevant addition to the complex therapy of dermatological diseases, includingpsoriasis. The skin affected by psoriasis requires “soft” care, so the use of a hygienic product that has a moisturizingand exfoliating effect will have a positive impact on the course of the disease, complementing the effect of the maintherapeutic agents. In view of this, based on the results of previous studies, we have proposed three compositionsof solid soaps, for which it is advisable to conduct a study of the main quality indicators at this stage of development.Aim. To develop

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Arefieva, Ol'ga Dmitriyevna, Polina Dmitriyevna Pirogovskaya, Aleksandr Yevgen'yevich Panasenko, Anna Vasil'yevna Kovekhova, and Lyudmila Alekseyevna Zemnukhova. "THE ACID-BASE PROPERTIES OF AMORPHOUS SILICA FROM STRAW AND RICE HUSK." chemistry of plant raw material, no. 1 (March 16, 2021): 327–35. http://dx.doi.org/10.14258/jcprm.2021017521.

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The present work shows results of studying acid-base properties of the surface by the methods of pH-metry and Hammett of amorphous silicon dioxide from rice husks and straw obtained by various schemes: oxidative firing; oxidative roasting with preliminary treatment with 0.1 M hydrochloric acid solution; precipitation from alkaline solutions. The samples obtained by the thermal method contain impurities of alkali, alkaline earth metals, aluminum, and aluminum and practically do not contain water. The composition of the deposited samples contains a small fraction of impurities (0.05%) and water

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Liang, Li, Wang Tie-qiao, Xue Bei, Liu Zhen-dong, and Zou Lan. "Chemical Composition and Functional Characteristics of Dietary Fibers from Pingguoli Pear (Pyrus Bretschneideri Rehd. cv. Pingguoli Pear)." Current Topics in Nutraceutical Research 18, no. 1 (2018): 39–45. http://dx.doi.org/10.37290/ctnr2641-452x.18:39-45.

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In this study, apple–pear pomace dietary fibers were treated with acid, alkali, cellulase, and hemicellulase. The effects of these treatments on the chemical constitutions, structural characteristics, functional properties, and the quality of apple–pear pomace dietary fibers were investigated. The results showed that the purity of apple–pear pomace dietary fibers was 79–83%, and the fiber contained cellulose, hemicellulose, pectin, and lignin. Their monosaccharide structures included mannose, glucosamine, ribose, rhamnose, glucuronic acid, galacturonic acid, galactosamine, glucose, galactose,

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