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Articles de revues sur le sujet « Precipitation reagents »

Auteur : Grafiati

Publié le 7 juin 2025

Mis à jour le 2 août 2025

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1

Karmawan, Listya Utami, Fenny Martha Dwivany, Rizkita Rachmi Esyanti, and I. Nyoman Pugeg Aryantha. "Pre-treatment and Suitable Reagent Enabled a Reliable and Consistent for Molecular Detection of Fusarium oxysporum f. sp. cubense Tropical Race 4 (Foc4)." HAYATI Journal of Biosciences 26, no. 4 (2019): 196. http://dx.doi.org/10.4308/hjb.26.4.196.

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Fusarium wilt which is caused by the soil-borne fungus, Fusarium oxysporum f.sp. cubense (Foc), is one of important diseases in banana plant. Foc tropical race 4 (Foc4) is the most pathogenic race which could infect various banana cultivars including Cavendish cultivar which was previously considered as resistant cultivar. Molecular detection of Foc using PCR analysis is indispensable to determine the race of Foc. We demonstrate a faster DNA isolation procedure described in previous method by substituting sodium acetate precipitation with ammonium acetate precipitation without affecting the re

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Kremenetskaya, Irina P., Svetlana I. Mazukhina, Svetlana V. Drogobuzhskaya, and Tatiana K. Ivanova. "Physical and chemical modeling of the ZnSO4-CaO(MgO)-SIO2-H2O system." Transactions of the Kоla Science Centre. Series: Natural Sciences and Humanities 1, no. 2/2022 (2022): 93–99. http://dx.doi.org/10.37614/2949-1185.2022.1.2.011.

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The paper presents the results of zinc precipitation from sulfate solutions with alkaline reagents (serpentinite magnesite and calcium oxide). X-ray diffraction, micromorphological analysis, and thermodynamic modeling revealed the formation of stable metastable silicate zinc-containing phase in the experiment with the use metaserpentine as a reagent. When calcium oxide is used as a reactant, zincite precipitated.

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RAKHMATILLAEVA, INDIRA ANVAROVNA1, and SHOKHISTA POLVANNAZIROVNA1 OLTIEVA. "REAGENTS IN THE ANALYSIS OF ALKALOIDS: A COMPREHENSIVE REVIEW." Multidisciplinary Journal of Science and Technology 5, no. 5 (2025): 91–99. https://doi.org/10.5281/zenodo.15346020.

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Alkaloids represent a diverse class of naturally occurring nitrogen-containing compounds with significant pharmaceutical and toxicological properties. This review examines the various reagents employed in the qualitative and quantitative analysis of alkaloids, focusing on their chemical principles, applications, and limitations. The classical precipitation reagents, color-forming reagents, and modern analytical techniques are discussed in detail. Special attention is given to the selectivity, sensitivity, and specificity of these reagents for different alkaloid classes. This comprehensive over

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Savory, D. J., and C. J. Pearce. "Paraprotein Interference Causing Pseudohyperphosphataemia: Evaluation of an Improved Methodology." Annals of Clinical Biochemistry: International Journal of Laboratory Medicine 32, no. 5 (1995): 498–501. http://dx.doi.org/10.1177/000456329503200511.

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The measurement of serum inorganic phosphorus by direct acid/molybdate assay is known to be subject to interference by some serum paraproteins. Serum samples from 45 paraproteinaemic patients were used for the measurement of inorganic phosphorus using a manufacturer's kit reagent and a detergent-modified reagent from the same manufacturer. In addition, the same samples were analysed with both reagents following precipitation of serum protein with trichloroacetic acid. Using the original reagent pseudohyperphosphataemia was found in 27% (12/45) of the samples. The modified reagent was free from

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Kroll, M. H., and R. Chesler. "Nonlinearity of high-density lipoprotein cholesterol determinations is matrix dependent." Clinical Chemistry 40, no. 3 (1994): 389–94. http://dx.doi.org/10.1093/clinchem/40.3.389.

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Abstract The majority of methods for determining high-density lipoprotein (HDL) cholesterol failed the 1991 College of American Pathologists (CAP) linearity survey (sets LN2-A, B, C). We hypothesized that they failed because of the survey material matrix. We evaluated linearity with dextran sulfate or phosphotungstate as the precipitating reagents for several methods: Ektachem; TDx; Sigma; Dimension; Cobas Fara, with Roche reagents; and the Hitachi 736, with precipitating reagents from Boehringer Mannheim Diagnostics. We tested CAP survey material, Sigma HDL-cholesterol control material, and a

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Chursin, Vyacheslav I., and Egor V. Panfilov. "PRECIPITATION OF CHROMIUM-CONTAINING TANNING SOLUTION OF SUSPENSION MAGNESIUM HYDROXIDE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 9 (2019): 110–16. http://dx.doi.org/10.6060/ivkkt.20196209.5918.

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Comparative studies of the deposition of tanning chromium compounds from waste tanning solutions of tannery production containing from 3 to 5 g/l chromium oxide were carried out, using as a chemical reagents a suspension of magnesium hydroxide and sodium carbonate solution. It is shown that the main factors influencing the precipitation process are the pH value and the consumption of the precipitant. The costs of reagents contributing to complete precipitation of chromium compounds in the form of a hydroxide are established. The high efficiency of the use of a suspension of magnesium hydroxide

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Kondo, Akira, Yoshinori Muranaka, Isao Ohta, and Takashi Kanno. "Dynamic Reaction in a Homogeneous HDL-Cholesterol Assay Visualized by Electron Microscopy." Clinical Chemistry 45, no. 11 (1999): 1974–80. http://dx.doi.org/10.1093/clinchem/45.11.1974.

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Abstract Background: Measurement of HDL-cholesterol (HDL-C) by homogeneous assays with automated analyzers is replacing precipitation methods. However, in this reaction-type assay, interactions between the reagents and lipoproteins remain unknown. Methods: Electron microscopy was used to investigate the reactions in a homogeneous HDL-C assay. Negative staining with 10 g/L uranyl acetate was performed for lipoprotein visualization by electron microscopy. Observations of the interactions between lipoproteins and the reagents of a polyanion-polymer/detergent assay were achieved by cooling the rea

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Selig, Walter S. "Quaternary ammonium halides: Versatile reagents for precipitation titrations." Journal of Chemical Education 64, no. 2 (1987): 141. http://dx.doi.org/10.1021/ed064p141.

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Chan, M. Y. Y., M. Hoare, and P. Dunnill. "The kinetics of protein precipitation by different reagents." Biotechnology and Bioengineering 28, no. 3 (1986): 387–93. http://dx.doi.org/10.1002/bit.260280312.

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Salina, Emanuele, and Luca Regazzoni. "Protein Precipitation by Metal Hydroxides as a Convenient and Alternative Sample Preparation Procedure for Bioanalysis." Molecules 30, no. 1 (2024): 2. https://doi.org/10.3390/molecules30010002.

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Protein precipitation is widely used for sample preparation ahead of liquid chromatography. This step is required to analyze small molecules without the interference of proteins contained in the matrix. Organic solvents and acidic chemicals are the two most popular reagents used for this scope. Organic solvents are quite effective precipitating agents, but require a medium-to-large sample dilution. Moreover, a high concentration of organic solvents in sample media can affect reversed phase separations. Therefore, an evaporation step, followed by the resuspension of the analytes in appropriate

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Kuznetsov, V. V., and Y. R. Prokopenko. "Concentration of strontium and barium by co-precipitation with organic collectors and their x-ray fluorescence determination." Zhurnal Analiticheskoi Khimii 79, no. 5 (2024): 495–505. https://doi.org/10.31857/s0044450224050087.

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The concentration of strontium and barium in the form of complexes with 11 organic reagents by co-precipitation with organic co-precipitants was studied for their subsequent determination by the X-ray fluorescence method. The most effective systems were those including reagents from the group of bisazo-substituted chromotropic acids—Nithchromazo and Chlorophosphonazo III. The complexes of these metals were almost quantitatively co-precipitated in the form of associates with the cations of the Brilliant Green dye when the collector was an associate of an excess of the analytical reagent with th

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Siegel, Frederic R. "Factors Influencing the Precipitation of Dolomitic Carbonates." Bulletin (Kansas Geological Survey), no. 152 (April 9, 2024): 129–58. https://doi.org/10.17161/kgsbulletin.no.152.20558.

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Dolomitic carbonates having d-spacing values of disordered dolomite or protodolomite, but lacking major super-reflections, have been precipitated from solutions in the laboratory. Conditions of temperature, pressure, and concentration employed were far less extreme than has previously been reported in the literature. Reagents used were Ca(NO3)2, MgSO4, and Na2CO3; activated charcoal was mixed with reacting solutions to reduce reaction rate so that effect of rate on the final product could be observed. Experimental results indicate that the pH of the precipitating medium, as controlled by the a

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Rout, K., M. Mohapatra, S. Layek, A. Dash, H. C. Verma, and S. Anand. "The influence of precursors on phase evolution of nano iron oxides/oxyhydroxides: optical and magnetic properties." New J. Chem. 38, no. 8 (2014): 3492–506. http://dx.doi.org/10.1039/c4nj00526k.

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van Rooyen, M., P. J. van Staden, and K. A. du Preez. "Sulphate removal technologies for the treatment of mine-impacted water." Journal of the Southern African Institute of Mining and Metallurgy 121, no. 10 (2021): 1–7. http://dx.doi.org/10.17159/2411-9717/1541/2021.

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Mine-impacted water, including acid mine drainage (AMD), is a global problem. While precipitation of dissolved metals and neutralization of acidity from mine-impacted water is accomplished relatively easily with lime addition, removal of sulphate to permissible discharge limits is challenging. This paper presents a high-level comparison of four sulphate removal technologies, namely reverse osmosis, ettringite precipitation, barium carbonate addition, and biological sulphate reduction. Primarily operating costs, based on reagent and utility consumptions, are compared. Each process is shown to b

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Rychkov, V. N., A. L. Smirnov, S. Yu Skripchenko, A. M. Pastukhov, and N. A. Poponin. "Precipitation of yellowcake from pregnant regenerate by various reagents." Journal of Radioanalytical and Nuclear Chemistry 314, no. 3 (2017): 1741–46. http://dx.doi.org/10.1007/s10967-017-5539-9.

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Gurbanov, Abdulaga N., and Ijabika Z. Sardarova. "Investigating the effect of reagents used in the transportation of hydrocarbons." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 6 (December 2024): 123–28. https://doi.org/10.32434/0321-4095-2024-157-6-123-128.

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The use of chemical reagents, such as paraffin inhibitors, viscosity regulators, anti-turbulence, and depressant additives, has recently been shown to significantly impact the rheological properties of oil flow. These additives function by forming asphaltene colloids through adsorption on aggregates, thereby reducing the energy of their interactions. This article describes the development, laboratory testing, and potential application in pipeline transport of the ANA-10 complex-action reagent, which combines the effects of an inhibitor of asphaltene-resin-paraffin deposits and an oil viscosity

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Białowicz, Katarzyna, Urszula Kiełkowska, and Mieczysław Trypuć. "Precipitation of calcium carbonate in the presence of urea at 293K." Polish Journal of Chemical Technology 10, no. 4 (2008): 7–10. http://dx.doi.org/10.2478/v10026-008-0038-y.

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Precipitation of calcium carbonate in the presence of urea at 293K The results of the precipitation of calcium carbonate from waste distillation liquor (DS) from the Solvay method and sodium bicarbonate saturated solution in the presence of urea were presented. The investigation was carried out at 293K. The influence of the time of reagents dosage to the solution of urea on the physicochemical character of obtaining product was studied. The time of reagents dosage: 1, 5, 10, 20, 30 min and the concentration of the urea applied: 0.5, 1, 2 and 4 mol/dm3. The granulometric composition, the values

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Kumar, R. K. "Immunogold-silver cytochemistry using a capillary action staining system." Journal of Histochemistry & Cytochemistry 37, no. 6 (1989): 913–17. http://dx.doi.org/10.1177/37.6.2470811.

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An improved method for immunogold-silver staining is described. Rat monoclonal antibodies to T-lymphocyte surface membrane antigens were employed to demonstrate T-cells and their subsets in frozen sections of mouse spleen and in smears of peripheral blood mononuclear cells. A capillary action staining system was used to perform all stages of the procedure, substantially reducing the technical effort involved, saving reagents, and improving reproducibility and control of batch staining. The use of a light-stable silver enhancement reagent simplified the development of the reaction product. Tech

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Erizal, Chika N Annisa, Heriansyah Putra, and Apriadi. "Improvement of the Shear Strength and Reduction of the Permeability of Sandy Soil using Soybean Crude Urease Calcite Precipitation (SCU-CP)." Jurnal Teknik Sipil dan Lingkungan 10, no. 1 (2025): 27–34. https://doi.org/10.29244/jsil.10.1.27-34.

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Calcite precipitation is a sustainable soil improvement method because it can increase soil strength and is environmentally friendly. This study aimed to evaluate the use of an innovative soil improvement method, namely soybean crude urease calcite precipitation (SCU-CP), in modifying the strength and permeability of sandy soil. Two types of reagents based on their purity, namely pro analysis (PA) and technical (technical grade), combined with two types of soybeans, namely seeds (conventional) measuring 0.1–0.5 mm and manufactured soybean powder measuring <0.1 mm, were used in this study as

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Bazarov, Adham Khayrullayevich, and Ozodbek Olimjon Ogli Sobirov. "Diagnosing Disease Of Cow Mastitis And Method Of Using Diffusion-Precipitation Reaction In Agar Gel." American Journal of Veterinary Sciences and Wildlife Discovery 03, no. 02 (2021): 5–8. http://dx.doi.org/10.37547/tajvswd/volume03issue01-02.

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The microbial factor is essential in the etiology of mastitis. In this regard, bacteriological diagnostics is one of the decisive moments in the recognition and differentiation of pathological conditions of the mammary gland. However, it takes a lot of time to make a diagnosis using general methods, special culture media and reagents.

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Okazaki, Mitsuyo, Keiko Sasamoto, Toshio Muramatsu, and Seijin Hosaki. "Evaluation of precipitation and direct methods for HDL-cholesterol assay by HPLC." Clinical Chemistry 43, no. 10 (1997): 1885–90. http://dx.doi.org/10.1093/clinchem/43.10.1885.

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Abstract HDL-cholesterol (HDL-C) values measured by precipitation (sodium phosphotungstate–MgCl2) and direct methods were compared with those obtained by HPLC with a new column (TSKgel Lipopropak) and an eluent (TSKeluent LP-1). The HDL-C values determined by the precipitation method were significantly (P &lt;0.001) lower than those by the HPLC method, whereas the HDL-C values by the direct method were slightly but significantly higher (P &lt;0.02) than those by the HPLC method. A quantitative HPLC analysis of the cholesterol concentration in HDL and non-HDL fractions in the supernatan

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Yuminova, A. A., E. A. Giniyatullina, L. M. Karieva, and L. G. Chekanova. "Physical-chemical properties of FM-1 reagent as a potential collector for ion flotation of lanthanoids." Bulletin of the Karaganda University. "Chemistry" series 105, no. 1 (2022): 113–21. http://dx.doi.org/10.31489/2022ch1/113-121.

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The physical-chemical properties of the industrial reagent “FM-1” have been investigated. These properties are necessary for evaluating its use as a collector in the processes of concentration of rare earth metal ions by ion flotation. “FM-1”, which is based on sodium salts of aminomethylenephosphonic acids, is used as a flocculant for oil production and purification of process waters from suspended particles and petroleum products. Protolytic equilibriums in aqueous solutions of the reagents were studied. The values of dissociation constants equaling pKa1 = 2.31±0.26 and pKa2 = 8.82±0.34 were

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Chen, Guo, Jin Chen, Lijun Liu, C. Srinivasakannan, and Jinhui Peng. "Synthesis and Characterization of BaCO3 Nanoparticles with Different Morphologies by Microwave Homogenous Precipitation." High Temperature Materials and Processes 32, no. 1 (2013): 47–50. http://dx.doi.org/10.1515/htmp-2012-0058.

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AbstractBaCO3 nanoparticles with different morphologies including needle-like, rod-like, bird's nest-like and flower-like have been successfully synthesized by the microwave homogeneous precipitation method using BaCl2·2H2O, NaOH and (NH2)2CO as raw materials with the help of different guide reagents, such as citric acid (CA), sodium triphosphate (STPP) and ethylene diamine tetraacetic acid (EDTA). Their phases and morphologies were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM), respectively. The characterization results show that different guide reagen

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Olmos, J. M., M. A. Lasunción, and E. Herrera. "Dextran Sulfate Complexes with Potassium Phosphate to Interfere in Determinations of High-Density Lipoprotein Cholesterol." Clinical Chemistry 38, no. 2 (1992): 233–37. http://dx.doi.org/10.1093/clinchem/38.2.233.

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Abstract The interference of dextran sulfate with the colorimetric determination of free cholesterol causes an increase in the absorbance that is proportional to the dextran sulfate concentration in the sample. This makes estimation of the free cholesterol concentration unreliable in high-density lipoprotein-containing supernates obtained after plasma precipitation with dextran sulfate/MgCl2. Analysis of the absorption spectrum demonstrated that the absorbance increase was due to turbidity. We observed this effect with colorimetric reagents based on potassium phosphate buffer but not with thos

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Sun, Yan Rong, Tao Fan, Chang An Wang, Li Guo Ma, and Feng Liu. "Template Induced Synthesis of Nano-Hydroxyapatite by Co-Precipitation Method." Advanced Materials Research 311-313 (August 2011): 1713–16. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1713.

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Nano-hydroxyapatite with different morphology was synthesized by the co-precipitation method coupled with biomineralization using Ca(NO3)2•4H2O and (NH4)2HPO4 as reagents, adding chondroitin sulfate, agarose and aspartic acid as template. The structure and morphology of the prepared powders were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM).

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Kuzin, Evgeniy N. "COMPLEX TITANIUM-CONTAINING REAGENTS IN WASTEWATER TREATMENT PROCESSES OF THE FISHING INDUSTRY." ChemChemTech 67, no. 7 (2024): 127–35. http://dx.doi.org/10.6060/ivkkt.20246707.6997.

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The issues of removing nutrients from wastewater from various industries have recently received more and more attention. Traditional coagulants based on aluminum and iron salts can effectively remove phosphate ions from water, but these reagents are not effective against ammonium ions. As part of the work done, the possibility of using complex titanium-containing coagulants in the processes of dephosphatization of wastewater from the fish processing industry was considered. It has been proven that the use of magnesium titanium reagents makes it possible to carry out the coprecipitation of ammo

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Strekalov, P., K. Runina, M. Mayakova, O. Petrova, and I. Avetissov. "Luminescent hybrid materials based on organic phosphors and fluorides in the PbF₂-LaF₃ system." Journal of Physics: Conference Series 2315, no. 1 (2022): 012008. http://dx.doi.org/10.1088/1742-6596/2315/1/012008.

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Abstract Powder hybrid materials based on 8-hydroxyquinolate lithium organic phosphor and - LaF3 inorganic fluoride matrix PbF2 have been synthesized. Hybrid materials were obtained by co-precipitation from aqueous-alcoholic solutions with ammonium fluoride under various conditions - different concentrations of precursor solutions, Pb/La ratio, and the siquensy of reagents’ mixing. All obtained hybrid materials showed effective broadband luminescence in the region of 390-500 nm. The photoluminescence intensity during reverse deposition was found to be higher than during direct deposition for d

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Zúñiga-Barra, Héctor, Eduardo Ortega-Martínez, Javiera Toledo-Alarcón, et al. "Potential Use of Microbially Induced Calcite Precipitation for the Biocementation of Mine Tailings." Minerals 13, no. 4 (2023): 506. http://dx.doi.org/10.3390/min13040506.

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Mining activities offer clear economic benefits for mineral-rich countries. However, mining operations can produce several environmental impacts. Many of these are associated with generating and managing mining waste known as tailings, which are typically stored in surface facilities. Windblown dust emissions from tailing deposits can cause severe damage to local ecosystems and adverse health effects for the surrounding population. Microbially induced calcite precipitation (MICP) can be used for the superficial biocementation of tailings, thereby preventing such emissions. This research studie

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Annapurna, V., G. Jyothi, A. V. Subbayamma, and B. B. V. Sailaja. "Spectrphotometric Determination of Buclizine as Hydrochloride Using Various Chromogenic Reagents." E-Journal of Chemistry 7, no. 4 (2010): 1523–29. http://dx.doi.org/10.1155/2010/350754.

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Simple, accurate and reproducible UV spectrophotometric methods were established for the assay ofbuclizine(BUCZ) based on the formation of precipitation, charge transfer complex and inner complex formation. Method A involves the precipitation, charge transfer complex formation of BUCZ with tannic acid/p-N-methyl aminophenol sulphate (PMAP)-Cr(VI), the complex formation with cobalt thiocyanate (CTC) in method B and inner complex formation of BUCZ with sodium nitroprusside hydroxylamine hydrochloride and sodium carbonate in method C were proposed. The optical characteristics such as Beers law li

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Rocha, Sônia D. F., Lydia Katsarou, and George P. Demopoulos. "Enhanced Stability of Scorodite in Oxic and Anoxic Systems via Surface Coating with Hydroxyapatite and Fluorapatite." Minerals 12, no. 8 (2022): 1014. http://dx.doi.org/10.3390/min12081014.

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With the objective of enhancing the stability of scorodite, its encapsulation with hydroxyapatite (Ca5(PO4)3OH) (HAP) and fluorapatite (Ca5(PO4)3F) (FAP) surface coatings, the two most stable of the calcium phosphates, inert to pH and redox potential variations, are presented in this work. The experimental work includes: (1) determination of the metastable zone for HAP and FAP precipitation, (2) the synthesis of crystalline scorodite under atmospheric conditions using hydrothermal scorodite seed and its characterization, (3) the coating of scorodite with hydroxyapatite and fluorapatite with su

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Huang, Xinran, Jiang Li, Mingxiao Su, Xiyun Jiao, Qiuming Wu, and Zhe Gu. "Exploration of Microbially Induced Carbonate Precipitation Technology for the Protection of Soil on Agricultural Drainage Ditch Slopes." Water 17, no. 13 (2025): 2010. https://doi.org/10.3390/w17132010.

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Microbially induced carbonate precipitation (MICP) offers an eco-friendly approach to stabilize porous materials. This study evaluates its feasibility for protecting agricultural drainage ditch slopes through laboratory tests. Liquid experiments assessed calcium carbonate (CaCO3) precipitation rates under varying bacteria–cementation solution ratios (BCR), cementation solution concentrations (1–2 mol/L), and urease inhibitor (NBPT) contents (0–0.3%). Soil experiments further analyzed the effects of solidified layer thickness (4 cm vs. 8 cm) and curing cycles on soil stabilization. The results

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Kabdaşlı, Işık, Alessio Siciliano, Carlo Limonti, and Olcay Tünay. "Is K-Struvite Precipitation a Plausible Nutrient Recovery Method from Potassium-Containing Wastes?—A Review." Sustainability 14, no. 18 (2022): 11680. http://dx.doi.org/10.3390/su141811680.

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The definition of technologies capable of removing and recovering nutrients from polluting effluents is a key environmental challenge. Through these technologies, it would be possible to protect aquatic systems and prevent the consumption of natural resources for the production of commercial fertilizers. In this regard, the application of the precipitation processes of struvite-type compounds is an attractive approach. Indeed, these processes are potentially able to remove nutrients from many effluents and produce a precipitate reusable as a slow-release fertilizer. The scientific community ha

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Nikolova, Katerina, Svetlana Bratkova, Anatoliy Angelov, Petia Genova, Rosen Ivanov, and Ani Stefanova. "TREATMENT OF SULPHATES-RICH SOLUTIONS THROUGH ETTRINGITE PRECIPITATION WITH INDUSTRIAL REAGENTS." SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL 1, no. 1 (2020): 74–78. http://dx.doi.org/10.58903/a14161833.

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Mine wastewaters are often characterised with high concentrations of sulphates, heavy metals and increased electrical conductivity. It is mandatory for the industry to implement convenient treatment methods in order to reduce these parameters. The aluminium precipitation with the simultaneous formation of ettringite was chosen for laboratory testing as it is appropriate when the concentrations of sulphates have to be reduced– up to 300 mg/l according to the Bulgarian regulatory framework. In the present study synthetic waters were treated, as their composition was similar to that of typical mi

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Katerina, Nikolova, Bratkova Svetlana, Angelov Anatoliy, Genova Petia, Ivanov Rosen, and Stefanova Ani. "TREATMENT OF SULPHATES-RICH SOLUTIONS THROUGH ETTRINGITE PRECIPITATION WITH INDUSTRIAL REAGENTS." SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL 1/2020, no. 1/2020 (2020): 93. https://doi.org/10.5281/zenodo.4270121.

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Mine wastewaters are often characterised with high concentrations of sulphates, heavy metals and increased electrical conductivity. It is mandatory for the industry to implement convenient treatment methods in order to reduce these parameters. The aluminium precipitation with the simultaneous formation of ettringite was chosen for laboratory testing as it is appropriate when the concentrations of sulphates have to be reduced–up to 300 mg/l according to the Bulgarian regulatory framework. In the present study synthetic waters were treated, as their composition was similar to that of typic

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Kim, N. S., V. P. Korneev, A. M. Petrunin, A. V. Chastuhin, and E. F. Voronin. "RESEARCH OF EFFICIENCY OF NANOSIZED POWDERED ICE-FORMING REAGENTS." HYDROMETEOROLOGY AND ECOLOGY. PROCEEDINGS OF THE RUSSIAN STATE HYDROMETEOROLOGICAL UNIVERSITY, no. 58 (2020): 31–40. http://dx.doi.org/10.33933/2074-2762-2020-58-31-40.

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The article discusses nanosized powdery ice-forming reagents, which are supposed to be used in the works on active action on clouds in order to regulate precipitation and hail suppression, as well as to dissipate supercooled fog. These ice-forming reagents have been obtained by the levilite method, in which a layer of silver iodide is deposited on the surface of nanosilica particles. Description of the methodology for studying the effectiveness of nanosized powdery ice-forming reagents, as well as the results of laboratory studies of their effectiveness obtained in different organizations is g

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Suvorin, А. V., M. N. Shorokhov, M. A. Ozheredova, O. N. Bliznjuk, I. M. Ryshchenko, and N. Yu Masalitina. "Purification of Cr(VI)-containing wastewater by chemical precipitation: test results of an experimental-industrial installation." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 3 (May 2021): 121–27. http://dx.doi.org/10.32434/0321-4095-2021-136-3-121-127.

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We present the main results of experimental and industrial study of the developed process and pilot plant for purification of the Cr(VI)-containing rinse water by chemical precipitation. This technique implies full or partial return of treated water to rinse workpieces after chromium plating and prepare working solutions (precipitators). We characterize the manufacturing scheme of the pilot plant and the mode of its performance. Saturated aqueous solutions of Са(ОH)2 and Ва(ОH)2 were used as precipitating reagents. The tests confirmed the possibility of automatic dosing the reagents with due r

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Chivavava, J., J. Petersen, and A. E. Lewis. "Comparing the recovery of rare earth elements from ion-adsorption clay leach solutions using various precipitants." Journal of the Southern African Institute of Mining and Metallurgy 124, no. 12 (2024): 737–47. https://doi.org/10.17159/2411-9717/730/2024.

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Rare earth elements (REEs) have special properties that prompted their extensive use in high-tech applications. The demand for REE has, therefore, increased over the past years, resulting in the supply risk of the materials. Extraction from non-conventional low-grade ores, like easy-to-mine ion-adsorption clays (IACs), by hydrometallurgical methods is being explored to supplement the supply of REEs. The extraction of REEs from low tenor IAC leach solutions requires enrichment using cost-effective methods such as precipitation. Therefore, the aim of this study was to understand the recovery of

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Shumilova, Marina A. "Comparison of calculated and practical parameters for the removal of copper ions in the form of hydroxocompounds from spent electrolytes." Himičeskaâ fizika i mezoskopiâ 26, no. 3 (2024): 433–41. http://dx.doi.org/10.62669/17270227.2024.3.37.

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Currently, the most common methods for cleaning spent galvanic solutions from heavy metals are reagent methods based on the deposition of poorly soluble hydroxides. The paper presents the results of the thermodynamic calculation of the minimum solubility and the corresponding pH range of copper hydroxide compounds formed during the precipitation of metal ions in the industrial waste from galvanic production using solutions of sodium hydroxide and sodium bicarbonate. A laboratory experiment was carried out for finding optimal conditions for the deposition of copper from spent acidic sulfuric ac

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O.P., Perepelytsya, Petrenko T.V., Homenko B.S., and Lazarenko M.M. "Interaction of phosphoric acid with carbonate sediment." Ukrainian Chemistry Journal 82, no. 2 (2016): 95–99. https://doi.org/10.5281/zenodo.4021179.

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Methods of chemical analysis of initial reagents, pН-measurement of filter solutions, thermogravimetry, and X-ray diffraction have studied the interaction inter phosphoric acid and industrial carbonate precipitation. The nature of the compounds is installed in obtained of the dry air, calcined at 660 and 850 <sup>о</sup>C the reaction product mixture. The temperatures of dehydration, interaction, and phase transitions are determined. It is shown that the obtained results can be used in the process of the creation of technology for the recycling of carbonate precipitation on the phosphate ferti

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Annapurna, V., G. Jyothi, V. Nagalakshmi, and B. B. V. Sailaja. "Spectrophotometric Methods for the Assay of Pyrilamine Maleate Using Chromogenic Reagents." E-Journal of Chemistry 7, no. 4 (2010): 1507–13. http://dx.doi.org/10.1155/2010/941506.

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Simple, accurate and reproducible UV spectrophotometric methods were established for the assay of pyrilamine maleate (PYRA) based on the formation of oxidative coupling and precipitation, charge transfer complexation products. Method A includes the oxidative coupling reaction of PYRA with 3-methyl-2-benzathiazolinone hydrazone (MBTH) in presence of Ce(IV). The formation of oxidative coupling product with 4-amino phenazone (4-AP) in presence of K3Fe(CN)6is incorporated in method B. Precipitation/charge transfer complex formation of the PYRA with tannic acid (TA)/Metol-Cr(VI) in method C were pr

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Pyagay, Igor, Olga Zubkova, Margarita Zubakina, and Viktor Sizyakov. "Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium." Inorganics 11, no. 7 (2023): 284. http://dx.doi.org/10.3390/inorganics11070284.

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The article is devoted to the neutralization of the harmful effects of aluminochrome catalyst sludge. Catalyst sludge is a waste product from petrochemical production and poses a serious threat to the environment and humans because of the toxic hexavalent chromium it contains. The emissions of Russian petrochemical enterprises’ alumochrome sludge is 10,000–12,000 tons per year. In this paper, research related to the possibility of reducing the harmful effects of sludge by converting hexavalent chromium to a less dangerous trivalent state is presented. The reduction of hexavalent chromium was c

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Żak, Sławomir. "Treatment of the Processing Wastewaters Containing Heavy Metals with the Method Based on Flotation." Ecological Chemistry and Engineering S 19, no. 3 (2012): 433–38. http://dx.doi.org/10.2478/v10216-011-0033-8.

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Treatment of the Processing Wastewaters Containing Heavy Metals with the Method Based on FlotationThe aim of the studies carried out at full technological scale was to indicate optimal systems of the two-stage precipitation and coagulation (PIX 113 - SAX 18, PAX XL1 - SAX 18, ALCAT 102 - lime milk and SAX 18 - PAX 16) in the process of eliminating heavy metals from wastewaters made in the processing plant producing sub-systems for domestic appliances. Precipitated pollutions were thickened by flocculation and separated by hydrogen peroxide enhanced pressure flotation. The experimental installa

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Wiebe, D. A., and S. J. Smith. "Six methods for isolating high-density lipoprotein compared, with use of the reference method for quantifying cholesterol in serum." Clinical Chemistry 31, no. 5 (1985): 746–50. http://dx.doi.org/10.1093/clinchem/31.5.746.

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Abstract Using 90 serum specimens, we compared six routine procedures for high-density lipoprotein (HDL) isolation to determine the biases, if any, of each. Use of the Reference Method for cholesterol (Duncan et al., Centers for Disease Control, Atlanta, GA) and automated dispensing equipment helped ensure the accuracy of the cholesterol measurements and minimized errors from sample and reagent manipulations. Regression analysis of the results showed significant differences between most HDL isolation methods, except for those involving precipitation with heparin-MnCl2 (1.0 mol/L) or polyethyle

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Kuzin, E. N., and N. E. Kruchinina. "BRUCITE-CONTAINING WASTE FROM THE PRODUCTION OF REFRACTORY MATERIALS IN WASTEWATER TREATMENT PROCESSES." Steklo i Keramika, no. 7 (July 2022): 58–63. http://dx.doi.org/10.14489/glc.2022.07.pp.058-063.

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As part of the study, an assessment was made of the possibility of using magnesium-containing waste from the production of periclase in the processes of engineering environmental protection. Evaluation of the efficiency of removal of phosphate and ammonium ions using powdered brucite, water-soluble magnesium salts and complex titanium-containing coagulants has been carried out. The high efficiency of magnesium-containing reagents in the processes of co-precipitation of sparingly soluble magnesium ammonium phosphate and in the processes of wastewater treatment with a high pH value has been prov

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Faucher, A., and M.-L. Daumer. "Effects of Crystallization Reagents on Phosphorus Precipitation from Nitrogen Treatment Pig Effluent." Proceedings of the Water Environment Federation 2011, no. 1 (2011): 617–33. http://dx.doi.org/10.2175/193864711802867315.

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Jokic, Bojan, Dusanka Tanaskovic, Ivona Jankovic-Castvan, Sasa Drmanic, Rada Petrovic, and Djordje Janackovic. "Synthesis of nanosized calcium hydroxyapatite particles by the catalytic decomposition of urea with urease." Journal of Materials Research 22, no. 5 (2007): 1156–61. http://dx.doi.org/10.1557/jmr.2007.0170.

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Nanosized calcium hydroxyapatite particles were synthesized by the catalytic decomposition of urea with urease. The influence of the synthesis parameters, i.e., temperature and ratio of the reagents/urease concentrations, on the size and morphology of the hydroxyapatite particles were investigated. As reagents for the synthesis of hydroxyapatite, various amounts of CaCl2, NaH2PO4, urea, and urease were used. The urease-catalyzed decomposition of urea leads to the homogeneous precipitation of hydroxyapatite because of the release of OH− ions during the hydrolysis of urea. In the same process, C

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KOVALEV, R. A., N. N. KORNEEVA, B. F. SALNIKOV, and D. O. LIFANOV. "THIN-LAYER SETTLING IN MODERN WATER TREATMENT TECHNOLOGIES." News of the Tula state university. Sciences of Earth 2, no. 1 (2020): 114–24. http://dx.doi.org/10.46689/2218-5194-2020-2-1-114-124.

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The use of polymer modules in the technological scheme can significantly intensify the process of precipitation and separation of mechanical and colloidal impurities from water by increasing the contact surface, increasing the lightening effect, and reducing the settling time. Also, in the process of cleaning, smaller doses of reagents are required and the problem of not effectively organized coagulation process is solved.

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Mykola, Yatskov, Korchyk Natalia, and Prorok Oleg. "DEVELOPING A TECHNOLOGY FOR PROCESSING CUPRUM CONTAINING WASTES FROM GALVANIC PRODUCTION AIMED AT THEIR FURTHER USE." Eastern-European Journal of Enterprise Technologies 6, no. 10 (102) (2019): 32–41. https://doi.org/10.15587/1729-4061.2019.186620.

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The study reports results of experimental studies into processing highly concentrated metal-containing wastes (HCMW) from galvanic production with obtaining precipitates of the predefined chemical composition, specified physical-and-chemical properties and with copper ions content. We defined the following precipitate properties in the study of copper-iron containing sludges obtained by coprecipitation of copper and iron-containing spent technological solutions (STS): humidity ‒ 89.7 %, density ‒ 1.17 kg/dm<sup>3</sup>, specific precipitate resistance ‒ 15–16∙10<sup>11</sup> m<sup>2

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Lin, Xiao Xuan, Xuan Qin, Qiu Ling Yao, Shan Shan Wu, and Xiu Feng Xiao. "Synthesis of Hydroxyapatite Microspheres with CAPB as Template." Advanced Materials Research 791-793 (September 2013): 145–48. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.145.

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Porous hollow hydroxyapatite (HA) microspheres were synthesized by Chemical Precipitation process using Ca (NO3)2·4H2O and (NH4)3PO4·3H2O as reagents and the CAPB as organic template. With increasing the amount of CAPB, the morphology of HA varies from irregular floccule to the rod form the spherical prototype and then grow into porous hollow microspheres. Furthermore, the possible formation mechanism of morphology change is also discussed.

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Minto, James M., Grainne El Mountassir, and Rebecca J. Lunn. "Micro-continuum modelling of injection strategies for microbially induced carbonate precipitation." E3S Web of Conferences 92 (2019): 11019. http://dx.doi.org/10.1051/e3sconf/20199211019.

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Microbially induced carbonate precipitation is a promising technique for ground improvement. In order for MICP to progress from a lab-scale process to a commercially viable alternative ground improvement option, a combination of field-trials and field-scale modelling of the process is required. We present the results of a field-scale model in which differing injection strategies are evaluated and find that longer treatment times make more efficient use of reagents, but may come with higher operational costs, and that utilising multiple strains of bacteria with different reaction kinetics and t

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