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Artykuły w czasopismach na temat „Hydrogen-ion concentration”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Gustavsson, Cart-in A.-S., Chritofer T. Lindgren, and Mikael E. Lindström. "Residual phase lignin in haft cooking related to the conditions in the cook." Nordic Pulp & Paper Research Journal 12, no. 4 (1997): 225–29. http://dx.doi.org/10.3183/npprj-1997-12-04-p225-23.

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Abstract The amount of lignin reacting according to the slow residual phase, i.e. the residual phase lignin, is in many perspectives an interesting issue. The purpose of the present investigation was to develop a mathematical model to show how the amount of residual phase lignin in the kraft cooking of spruce chips (Picm ahies) depends on the conditions in the earlier phases of the cook. The variables studied were hydroxide ion concentration, hydrogen sulfide ion concentration and ionic strength. The liquor-to-wood ratio during pulping was very high to maintain approximately constant chemical

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2

Shi, Laishun, Jian Gao, and Jingjing Chen. "Modeling study for oscillatory reaction of chlorite – iodide – ethyl acetoacetate." Canadian Journal of Chemistry 92, no. 5 (2014): 417–25. http://dx.doi.org/10.1139/cjc-2014-0072.

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Chlorine dioxide based chemical oscillating behavior was modeled by a simple scheme consisting of three component reactions. Furthermore, little is known about the influence of the pH value. In this study, four component reactions were used to model the chlorite – iodide – ethyl acetoacetate oscillating reaction by dynamic analysis software. The oscillatory phenomenon is observed for concentration changes of triiodide ion, chlorite ion, and hydrogen ion. The initial concentration of ethyl acetoacetate, chlorite ion, iodide ion, and hydrogen ion has great influence on oscillations. The amplitud

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3

TAKAHASHI, Kyoh-Ichi. "Methods measuring intracellular hydrogen ion concentration." Hikaku seiri seikagaku(Comparative Physiology and Biochemistry) 13, no. 2 (1996): 136–43. http://dx.doi.org/10.3330/hikakuseiriseika.13.136.

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4

Norn, M. S. "HYDROGEN ION CONCENTRATION OF TEAR FLUID." Acta Ophthalmologica 46, no. 2 (2009): 189–200. http://dx.doi.org/10.1111/j.1755-3768.1968.tb05176.x.

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5

Zhang, Lu Si, Jie Ding, Wan Qian Guo, Lei Gao, Nan Qi Ren, and Guo Xiang Zheng. "The Effect of Na-Ion on the Growth and Hydrogen Generation of Hydrogen-Producing Bacteria Yuan-3." Advanced Materials Research 455-456 (January 2012): 954–59. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.954.

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Hydrogen-producing zymogenous bacteria YUAN-3 (Ethanoligenens harbinense) is used as the study object, on which the intermittent hydrogen production test is applied to examine the influence of Na-ion concentration on the growth and gas generation of YUAN-3. Research results show that when Na ion concentration is 1.5g/L, cell concentration reaches the maximum level 0.892g/L; when Na-ion concentration is maintained at 2.0~3.0g/L, culture medium is applicable for hydrogen generation of YUAN-3.

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6

Dimitrijevic, Mile, Milan Antonijevic, and Valentina Dimitrijevic. "Kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions." Journal of the Serbian Chemical Society 64, no. 12 (1999): 753–64. http://dx.doi.org/10.2298/jsc9912753d.

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The kinetics of pyrite oxidation by hydrogen peroxide in phosphoric acid solutions were investigated. The effects of stirring, temperature, and particle size, as well as of the hydrogen peroxide and phosphoric acid concentrations were studied. The effect of phosphate ion addition was also examined. The oxidation kinetics was found to follow a shrinking core model, with the surface chemical reaciton as the rate-controlling step. This is in accord with an activation energy of 57 kJ/mol and a linear relationship between the rate constant and the reciprocal of the particle radius. The reaction ord

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7

Beck, Mihaly T., and Gyula Rabai. "Oscillations and oligoscillations in hydrogen ion concentration." Journal of Physical Chemistry 89, no. 18 (1985): 3907–10. http://dx.doi.org/10.1021/j100264a029.

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8

Koohestani, Hassan, and Amirabbas Kheilnejad. "Hydrogen Generation and Pollution Degradation from Wastewater Using TiO2–CuO Nanocomposite." Journal of Nanoscience and Nanotechnology 20, no. 9 (2020): 5970–75. http://dx.doi.org/10.1166/jnn.2020.18544.

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Simultaneous production of hydrogen and degradation of cyanide ion and methyl red dye were successfully accomplished by employing nano-particles of TiO2–CuO under the radiation of UV light. Exploiting composites improves the electron–hole separation and consequently optimizes photocatalytic processes. Furthermore, the simultaneity of several photocatalytic processes decreases the rate of electron–hole recombination. According to the results, more hydrogen was produced in lower pHs. Up to the initial concentration of 0.3 and 0.8 mol/L for methyl red and cyanide ion respectively, the presence of

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9

Kitchen, Diane L., A. M. Merritt, and J. A. Burrow. "Histamine-induced gastric acid secretion in horses." American Journal of Veterinary Research 59, no. 10 (1998): 1303. http://dx.doi.org/10.2460/ajvr.1998.59.10.1303.

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Abstract Objective To determine gastric secretory responses in horses treated with histamine and to determine the dose of histamine needed to elicit maximal gastric secretion. Animals 6 adult horses with an indwelling gastric cannula. Procedure Gastric contents were collected in 15-minute periods, and volume, pH, hydrogen ion concentration, hydrogen ion output, sodium concentration, and sodium output were determined. Values were determined without any treatment (baseline), after administration of pyrilamine maleate (1 mg/kg of body weight, IV, given during a 15-minute period), and during 1-hou

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10

Luan, Guo Yan, Wei Ping Gao, and Ping Jing Yao. "Study on Experiments of Ion Exchange Resin Column for Purification of Hydrogen Peroxide." Advanced Materials Research 396-398 (November 2011): 596–99. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.596.

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The technologies of ion exchange resin for ultra pure hydrogen peroxide production are more and more focused. The aim of this research was to determine suitable parameters for effective removal of Na+ impurities from aqueous hydrogen peroxide solution to produce ultra pure hydrogen peroxide. Dynamic experiments for the different operation conditions, i.e., initial concentration, flow rate, ratio of height to diameter were carried out. The concentrations of Na+ of the effluents from the ion exchange resin column were determined by ICPS-7510.The breakthrough curves of Na+ were measured and analy

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11

Radke, K. J., E. G. Schneider, R. E. Taylor, and R. E. Kramer. "Effect of hydrogen ion concentration on corticosteroid secretion." American Journal of Physiology-Endocrinology and Metabolism 250, no. 3 (1986): E259—E264. http://dx.doi.org/10.1152/ajpendo.1986.250.3.e259.

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The direct effects of changes in extracellular hydrogen ion (H+) concentration on corticosteroid secretion under basal and ACTH-stimulated conditions were studied in isolated, perfused canine adrenal glands. Changes in extracellular H+ concentration were produced by altering either PCO2 or [HCO-3] of the Krebs-bicarbonate perfusate. Alkalosis markedly inhibited ACTH-stimulated aldosterone secretion. Moreover, within the range of pH from 7.19 to 7.85, there was a positive correlation between H+ concentration and the fractional secretion of aldosterone but a negative correlation between H+ conce

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12

TOMODA, Susumu, and Akira SUGAWARA. "Study on hydrogen ion concentration of lapping liquid." Journal of the Japan Society for Precision Engineering 54, no. 2 (1988): 372–77. http://dx.doi.org/10.2493/jjspe.54.372.

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13

Buchner, E. H. "The Hofmeister series and the hydrogen ion concentration." Recueil des Travaux Chimiques des Pays-Bas 49, no. 12 (2010): 1150–60. http://dx.doi.org/10.1002/recl.19300491210.

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14

Lan, Rui-Jia, Ji-Tai Li, Han-Wen Sun, and Wen-Bin Su. "Degradation of naproxen by combination of Fenton reagent and ultrasound irradiation: optimization using response surface methodology." Water Science and Technology 66, no. 12 (2012): 2695–701. http://dx.doi.org/10.2166/wst.2012.508.

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A central composite factorial design methodology was employed to optimize the degradation of naproxen (NPX) by the combination of Fenton reagent and ultrasound (US) irradiation. In this study, the variables considered for the process optimization were the hydrogen peroxide, ferrous ion and NPX initial concentrations, while ultrasonic power amplitude was adjusted at 90% and initial pH was 3. An appropriate quadratic model was developed in order to plot the response surface and contour curves. Optimum dosage of Fenton reagent for NPX removal was found to be hydrogen peroxide concentration = 9.98

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15

Alston, R. Peter, Laura Cormack, and Catherine Collinson. "Metabolic acidosis developing during cardiopulmonary bypass is related to a decrease in strong ion difference." Perfusion 19, no. 3 (2004): 145–52. http://dx.doi.org/10.1191/0267659104pf751oa.

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Metabolic acidosis is a frequent complication of cardio-pulmonary bypass (CPB). Commonly, its cause is ascribed to hypoperfusion; however, iatrogenic causes, related to the composition and volume of intravascular fluids that are administered, are increasingly being recognized. The aim of this study was to determine if metabolic acidosis during CPB was associated with hypoperfusion, change in strong ion difference (SID) or haemodilution. Forty-nine patients undergoing cardiac surgery using CPB in the Royal Infirmary of Edinburgh (RIE) or the HCI, Clydebank were included in the study. Arterial b

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16

Kurko, Sandra, Ljiljana Matovic, Nikola Novakovic, et al. "Changes of structural and hydrogen desorption properties of MgH2 indused by ion irradiation." Chemical Industry 64, no. 3 (2010): 227–32. http://dx.doi.org/10.2298/hemind091221034k.

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Changes in structural and hydrogen desorption properties of MgH2 induced by ion irradiation have been investigated. MgH2 powder samples have been irradiated with 45 keV B3+ and 120 keV Ar8+ions, with ion fluence of 1015 ions/cm2. The effects of ion irradiation are estimated by numerical calculations using SRIM package. The induced material modifications and their consequences on hydrogen dynamics in the system are investigated by XRD, particle size distribution and TPD techniques. Changes of TPD spectra with irradiation conditions suggest that there are several mechanisms involved in desorptio

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17

Popov, Artemiy A., A. G. Illarionov, and S. V. Grib. "Applying the Electron Concentration Calculation Method to Assess the Influence of Hydrogen on the Position of the Variable Solubility Lines in Ti-Cr System." Solid State Phenomena 265 (September 2017): 563–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.563.

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A possibility of using the electron concentration calculation method to evaluate Acm and Ac3 temperatures in the Ti-Cr system alloys with different hydrogen content (0.15-0.93 wt %) is considered. It is found that the proposed method gives results similar to the experimental data only in the case of low hydrogen concentrations since it does not take into account the degree of hydrogen ion screening by electrons.

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18

Baksht, F. G., V. G. Ivanov, S. I. Kon’kov, and S. M. Shkol’nik. "Determination of the negative hydrogen ion concentration in a cesium-hydrogen discharge." Technical Physics 46, no. 8 (2001): 946–51. http://dx.doi.org/10.1134/1.1395113.

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19

Kambarov, Asadjon, Israiljon Shamshidinov, Rixsitilla Najmiddinov, et al. "Study of the Effect of Magnesium Sulfate and Ammonium Nitrate on the Chemical Activity of Solutions of Phosphoric Acid." IOP Conference Series: Earth and Environmental Science 1275, no. 1 (2023): 012002. http://dx.doi.org/10.1088/1755-1315/1275/1/012002.

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Abstract The present study aimed to study the effect of magnesium sulfate and ammonium nitrate on the chemical activity of phosphoric acid solutions. The results of studies on increasing the chemical activity of extractive phosphoric acid from Central Kyzylkum and Karatau phosphorites due to the concentration of the first hydrogen ions and the pH of the medium are presented. It has been shown that introducing magnesium sulfate heptahydrate into the acid reduces the concentration of the first hydrogen ions. Adding an amount of ammonium nitrate increases the concentration of the first hydrogen i

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20

Sunaba, Toshiyuki, Susumu Hirano, and Tadao Ishihara. "Influence of Chloride for SCC Susceptibility on 15Cr Stainless Steel at High Temperatures under CO₂ Environment." Key Engineering Materials 741 (June 2017): 42–49. http://dx.doi.org/10.4028/www.scientific.net/kem.741.42.

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The effects of chloride ion concentration on SCC susceptibility of 15Cr and 13Cr martensitic stainless steels were investigated at 180°C by SSRT. Transgranular SCC occurred in the environment containing CO2 and chloride ion. The increasing chloride ion concentration was significantly affected SCC susceptibility of 15Cr SS. In addition, the contribution of hydrogen to SCC was examined at high temperature by SSRT with electrochemically polarization. The cathodically charged specimens showed hydrogen embrittlement. The fracture surface was similar to that of high temperature SCC. On the other han

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21

Saitou, Hiroshi, Taiichi Tanabe, Makoto Watanabe, and Akio Kanuma. "Study of Hydrogen Ion Concentration in the Periodontal Pocket." Proceeding of Japanese Society of Stomatognathic Function 5 (1987): 83–89. http://dx.doi.org/10.7144/sgf1982.5.83.

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22

TANAKA, Takashi. "Automatic Measuring System for Hydrogen Ion Concentration in Rainfall." Journal of Chemical Software 4, no. 3 (1998): 113–18. http://dx.doi.org/10.2477/jchemsoft.4.113.

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23

HUANG, Qian-Zi, Mei-Hua TANG, Zhi-Yi ZHANG, et al. "Simplification of the Hydrogen Ion Concentration Calculation Using MATLAB." University Chemistry 31, no. 3 (2016): 78–81. http://dx.doi.org/10.3866/pku.dxhx20160378.

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24

Oliveira, Andrea, Mario Henrique Gonzalez, Helena Müller Queiroz, and Solange Cadore. "Fractionation of inorganic arsenic by adjusting hydrogen ion concentration." Food Chemistry 213 (December 2016): 76–82. http://dx.doi.org/10.1016/j.foodchem.2016.06.055.

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25

Dahl, Helena, and Claus Dahl. "Hydrogen ion concentration of tear fluid in newborn infants." Acta Ophthalmologica 63, no. 6 (2009): 692–94. http://dx.doi.org/10.1111/j.1755-3768.1985.tb01582.x.

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26

Trotman, E. R. "Hydrogen Ion Concentration and its Application to Textile Industries." Journal of the Society of Dyers and Colourists 42, no. 7 (2008): 208–10. http://dx.doi.org/10.1111/j.1478-4408.1926.tb01387.x.

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27

Oparin, R. D., and M. G. Kiselev. "Near Infrared Spectroscopy As an Effective Way of Studying Hydrogen Bonding in a LiCl–H2O–CO2 Ternary Mixture." Russian Journal of Physical Chemistry A 96, no. 4 (2022): 724–31. http://dx.doi.org/10.1134/s0036024422040239.

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Abstract The possibility of using near IR spectroscopy to analyze the effect isobaric heating has on hydrogen bonding in an aqueous solution of LiCl in equilibrium with supercritical carbon dioxide (a LiCl–H2O–scCO2 ternary mixture) is demonstrated in a wide range of electrolyte concentrations. It is shown that this approach is highly efficient when studying ion and molecular systems with different types of interparticle interactions. The use of near IR spectroscopy allows distinguishing spectral contributions from hydrogen bonded n-mers of bulk water and water molecules in the solvation shell

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28

Khavala, Vedasri Bai, Christian Schneemann, Valentina Kallina, Tiju Thomas, Budaraju Srinivasa Murty, and Mehtap Oezaslan. "The Role of Iron Impurities on Nickel Cathodes for Hydrogen Evolution Reaction (HER)." ECS Meeting Abstracts MA2024-01, no. 34 (2024): 1823. http://dx.doi.org/10.1149/ma2024-01341823mtgabs.

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Over the last decades, several studies have reported the effect of traces of iron species on the improvement of the oxygen evolution reaction (OER) kinetics for nickel-based anode materials in alkaline media. [1] However, the effect of iron impurities on the hydrogen evolution reaction (HER) is still a subject to debate. For instance, at low iron concentrations (0.03 – 0.5 ppm) a loss of the HER activity for Ni surface is observed due to the electrochemical deposition of less active Fe. [2,3] Other studies showed less deactivation behavior of the Ni cathode at 3 and 14 ppm iron ion concentrati

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Beilke, MA, C. Collins-Lech, and PG Sohnle. "Candidacidal activity of the neutrophil myeloperoxidase system can be protected from excess hydrogen peroxide by the presence of ammonium ion." Blood 73, no. 4 (1989): 1045–49. http://dx.doi.org/10.1182/blood.v73.4.1045.1045.

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Abstract Excessive concentrations of hydrogen peroxide inhibit the neutrophil myeloperoxidase system, presumably by inactivating the hypochlorous acid produced by this system. Ammonium ion generated by neutrophils and other cells can react with hypochlorous acid to produce monochloramine, an oxidant with good microbicidal activity, but relative resistance to inactivation by other compounds. In an assay based on the oxidation of 5-thio-2-nitrobenzoic acid, hydrogen peroxide reacted more readily with sodium hypochlorite (used as a source of hypochlorous acid) than with monochloramine. Also, in t

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Beilke, MA, C. Collins-Lech, and PG Sohnle. "Candidacidal activity of the neutrophil myeloperoxidase system can be protected from excess hydrogen peroxide by the presence of ammonium ion." Blood 73, no. 4 (1989): 1045–49. http://dx.doi.org/10.1182/blood.v73.4.1045.bloodjournal7341045.

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Excessive concentrations of hydrogen peroxide inhibit the neutrophil myeloperoxidase system, presumably by inactivating the hypochlorous acid produced by this system. Ammonium ion generated by neutrophils and other cells can react with hypochlorous acid to produce monochloramine, an oxidant with good microbicidal activity, but relative resistance to inactivation by other compounds. In an assay based on the oxidation of 5-thio-2-nitrobenzoic acid, hydrogen peroxide reacted more readily with sodium hypochlorite (used as a source of hypochlorous acid) than with monochloramine. Also, in this assay

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31

Malla, Komal Prasad, Bishnu Prasad Neupane, Bindu Malla, Anil Gautam, and Dinesh Chaudhary. "Sulfide ion Selective Method of Analysis of Sulfurated Hydrogen in Alkaline Smoked Cigarette Solution." Journal of Health and Allied Sciences 5, no. 1 (2019): 67–71. http://dx.doi.org/10.37107/jhas.39.

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Sulfurated hydrogen commonly called hydrogen sulfide (H2 S) is a clear, colorless, extremely toxic gas that has a rotten egg smell at low concentration. The human nose can detect H2 S at concentrations below 100 parts per billion (ppb). It is found least amount in cigarette smoke that has been the subject of analysis for many analytical chemists. This gases is soluble in alkaline medium and gives free sulfide (S-2 ) ions. Sulfide ion concentration in cigarette smoke solution is found in the range of detection limit of lab made Silver- silver sulfide (Ag/Ag2 S) ion selective electrode (ISE).Thi

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32

Jones, G. V., B. M. Wall, H. H. Williams, D. N. Presley, D. G. Sapir, and C. R. Cooke. "Modulation of plasma aldosterone by physiological changes in hydrogen ion concentration." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 262, no. 2 (1992): R269—R275. http://dx.doi.org/10.1152/ajpregu.1992.262.2.r269.

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To assess the effect of extracellular hydrogen ion concentration (PH+) on aldosterone secretion, studies in which other known modulators could be controlled were performed on 13 patients undergoing hemodialysis. High (35 mM) or low (14-17 mM) dialysate bicarbonate concentrations were utilized on separate days to either decrease or increase PH+, while plasma potassium concentrations (PK) were held at constant levels and changes in plasma renin activity (PRA) were minimized by avoiding changes in body weight. Changes in PH+ were associated with concordant changes in plasma aldosterone concentrat

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Naumenkova, Valentina. "Optimizing stallion semen dilution based on hydrogen ion index." BIO Web of Conferences 149 (2024): 01002. http://dx.doi.org/10.1051/bioconf/202414901002.

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The dependence of the results on the individual qualities of stallion semen is very high, which is an obstacle to the wider use of the cryopreservation method in practice. It has been shown in this work that semen from successive samples from the same stallion has different hydrogen ion concentrations (pH) and different buffer capacities. When Lactose-chelate-citrate-yalk environment (LCHCY) is diluted, the pH of semen varies depending on its initial value. But in 30-40% of cases, the hydrogen ion concentration (pH) shifts more or less from the expected value. In order to establish the maximum

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Liu, Chao Zhuo. "Analysis of Hydrogen Content in Hydride Film by Elastic Recoil Method." Advanced Materials Research 457-458 (January 2012): 170–73. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.170.

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The essential principle of elastic recoil detection analysis (ERDA) of hydrogen content in the film and the experimental method were described briefly. The energy spectrum of the recoiled hydrogen atom can be obtained by the elastic collision of incident ion beam with hydrogen atoms in film, and the spectrum can be transferred easily into hydrogen concentration and depth profile. For illustrating the application of ERDA in hydrogen storage research, a beam of helium ion was used to recoil hydrogen in titanium hydride and deuteride film to obtain hydrogen contents and depth profiles. This techn

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Bunge, A. L., and C. J. Radke. "The Origin of Reversible Hydroxide Uptake on Reservoir Rock." Society of Petroleum Engineers Journal 25, no. 05 (1985): 711–18. http://dx.doi.org/10.2118/11798-pa.

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Abstract When reservoir solids reversibly consume hydroxide, the impact on alkaline-waterflood performance can be significant. Only recently has this reaction been recognized as a principal factor influencing oil recovery rates and chemical-pulse depletion. This paper considers the origin of the reversible hydroxide uptake to be ion exchange of sodium for hydrogen ions. Using a simple, mass-action equilibrium model, we describe the alkali exchange isotherm. Because hydronium and hydroxide concentrations in water are never zero, hydroxide uptake must be reported relative to a reference pH and s

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36

Kraig, R. P., and A. J. L. Cooper. "Bicarbonate and ammonia changes in brain during spreading depression." Canadian Journal of Physiology and Pharmacology 65, no. 5 (1987): 1099–104. http://dx.doi.org/10.1139/y87-172.

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An alkaline, followed by an acid-going transient, characterizes acid-base changes in the interstitial space during spreading depression in a variety of brain structures. In rat, such changes are associated with a significant rise in brain lactate content. How brain proton buffers behave during spreading depression is unknown. Techniques to significantly improve the response time of gas permeable membrane semimicroelectrodes for carbon dioxide and ammonia are reported. Measurements with such electrodes, when coupled to measurements of hydrogen ion concentration (from microelectrodes), permit ra

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37

Noor, Ehteram A., and Fatma M. Al-Solmi. "Analysis of Adsorption, Ion Exchange, Thermodynamic Behaviour of Some Organic Cations on Dowex 50WX4-50/H+Cation Exchanger in Aqueous Solutions." E-Journal of Chemistry 8, s1 (2011): S171—S188. http://dx.doi.org/10.1155/2011/963603.

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The equilibrium adsorption, ion exchange characteristics of various concentrations of some organic cations from aqueous solutions onto dowex 50WEX/H+cation exchanger were studied at different temperatures in the range of 30-50 °C. The studied cations showed good adsorptive properties onto dowex 50WX4-5/H+at different concentrations and temperatures. Main adsorption behaviour was ion exchange between hydrogen ions and the organic cations as indicated from the linear relation between the initial concentration of the organic cations and the released hydrogen ions. It was found that the adsorption

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38

Pokorný, Petr, Vítězslav Vacek, Nikola Prodanovic, Adam Zabloudil, Jaroslav Fojt, and Viktor Johánek. "The Influence of Graded Amount of Potassium Permanganate on Corrosion of Hot-Dip Galvanized Steel in Simulated Concrete Pore Solutions." Materials 15, no. 21 (2022): 7864. http://dx.doi.org/10.3390/ma15217864.

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This paper evaluates the amount of KMnO4 in simulated concrete pore solution (pH 12.8) on the corrosion behaviour of hot-dip galvanized steel (HDG). In the range of used MnO4− (10−4, 10−3, 10−2 mol·L−1), corrosion behaviour is examined with regard to hydrogen evolution and composition (protective barrier properties) of forming corrosion products. The corrosion behaviour of HDG samples is evaluated using Rp/Ecorr and EIS. The composition of corrosion products is evaluated using SEM, XRD, XPS and AAS. The effective MnO4− ion concentration to prevent the corrosion of coating with hydrogen evoluti

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TOMODA, Susumu, and Akira SUGAWARA. "Study on Hydrogen Ion Concentration of Lapping Liquid (2nd Report)." Journal of the Japan Society for Precision Engineering 56, no. 1 (1990): 158–63. http://dx.doi.org/10.2493/jjspe.56.158.

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Kowalchuk, J. M., G. J. Heigenhauser, M. I. Lindinger, J. R. Sutton, and N. L. Jones. "Factors influencing hydrogen ion concentration in muscle after intense exercise." Journal of Applied Physiology 65, no. 5 (1988): 2080–89. http://dx.doi.org/10.1152/jappl.1988.65.5.2080.

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To assess the importance of factors influencing the resolution of exercise-associated acidosis, measurements of acid-base variables were made in nine healthy subjects after 30 s of maximal exercise on an isokinetic cycle ergometer. Quadriceps muscle biopsies (n = 6) were taken at rest, immediately after exercise, and at 3.5 and 9.5 min of recovery; arterial and femoral venous blood were sampled (n = 3) over the same time. Intracellular and plasma inorganic strong ions were measured by neutron activation and ion-selective electrodes, respectively; lactate concentration ([La-]) was measured enzy

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KRONFELD, D. S., P. L. FERRANTE, LYN E. TAYLOR, and W. TIEGS. "Partition of plasma hydrogen ion concentration changes during repeated sprints." Equine Veterinary Journal 31, S30 (2010): 380–83. http://dx.doi.org/10.1111/j.2042-3306.1999.tb05252.x.

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Wanqing, Luo. "The characterization of hydrogen ion concentration in sequential cumulative rainwater." Atmospheric Environment 35, no. 35 (2001): 6219–25. http://dx.doi.org/10.1016/s1352-2310(01)00235-7.

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Zou, Zhiqiang, Lijinhong Huang, Xindong Li, et al. "Adsorption of Hydrated Pr3+ and NH4+/Mg2+ Ions onto the (001) Surface of Montmorillonite: A DFT Analysis with Experimental Verification." Minerals 12, no. 11 (2022): 1454. http://dx.doi.org/10.3390/min12111454.

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Montmorillonite is a major mineral present in ion-adsorption rare earth ores, and the microscopic adsorption states of rare earth ions on its surface are of a great significance for the efficient exploitation of ion-adsorption rare earth ores. In this article, density functional theory calculations were used to investigate the adsorption mechanisms and bonding characteristics of hydrated Pr, Mg and NH4 ions on the (001) surface of montmorillonite. Pr3+ exhibited a directed tendency geometry with Pr(H2O)103+, which was adsorbed onto montmorillonite by hydrogen bonding with an adsorption energy

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Restrepo, Gloria M., Alejandro Rincón, and Óscar J. Sánchez. "Kinetic Analysis of Gluconacetobacter diazotrophicus Cultivated on a Bench Scale: Modeling the Effect of pH and Design of a Sucrose-Based Medium." Fermentation 9, no. 8 (2023): 705. http://dx.doi.org/10.3390/fermentation9080705.

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Gluconacetobacter diazotrophicus is an endophytic bacterium that has shown important plant growth-promoting properties. During the growth of G. diazotrophicus with high carbon source concentrations, organic acids are produced, and pH decreases, thus inhibiting biomass growth. The objective of this work was to design a sucrose-based medium and perform a kinetic analysis of the batch submerged cultivation of this bacterium in a 3 L stirred-tank bioreactor without pH control. A mathematical model was proposed for representing G. diazotrophicus concentration, considering the inhibitory effect of h

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Pradhananga, Raja Ram, A. Nyachhyon, A. P. Yadav, Lok Kumar Shrestha, and S. Tandukar. "Fabrication and Applications of Silver Sulphide Based Ion Sensors." Advanced Materials Research 117 (June 2010): 7–14. http://dx.doi.org/10.4028/www.scientific.net/amr.117.7.

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An electrochemical sensor based on the silver sulphide precipitate was fabricated in the laboratory and characterized by x-ray diffraction, SEM equipped with EDAX, and electrochemical techniques. Ion selective electrode (ISE) was found to be sensitive enough to sense the sulphide ion concentration from 10-1 to 10-5 M in alkaline medium. The change in electrode potential per decade change in sulphide ion concentration was found to be 31.5 mV at laboratory temperature indicating adherence of the ion selective electrode to Nernst’s equation. The sensor have been successfully used for the quantita

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Anderson, Seth R., Samuel G. Johnstone, Aaron M. Dent, Beichen Liu, Wenxiao Guo, and Matthew A. Gebbie. "Co-Ion Identity Affects Double Layer Structure and Reactivity Trends in the Hydrogen Evolution Reaction." ECS Meeting Abstracts MA2024-02, no. 61 (2024): 4131. https://doi.org/10.1149/ma2024-02614131mtgabs.

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The formation of an electric double layer is ubiquitous in electrolytes undergoing electrochemical reactions. Currently, models for the double layer rely on the assumptions of dilute electrolyte theory where ions in solution do not interact. Dilute electrolyte theory predicts that solely hydrated counterions, or ions opposing the surface charge, occupy the near surface region and impact reactivity. Since this theory does not account for conditions like high applied potentials and high ion concentrations, understanding the relationship between double layer structure and electrochemical reactivi

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Chang, F. Y., and C. Y. Lin. "Calcium effect on fermentative hydrogen production in an anaerobic up-flow sludge blanket system." Water Science and Technology 54, no. 9 (2006): 105–12. http://dx.doi.org/10.2166/wst.2006.867.

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The effects of calcium ions on a granular fermentative hydrogen production system were investigated in four lab-scale UASB reactors that fed on sucrose (20 g COD/L). The reactors were seeded with anaerobic sewage sludge microflora and operated at a temperature of 35±1°, pH of 6.7 with hydraulic retention times (HRTs) of 24–6 h. The experimental results indicated that calcium ion addition (75∼150 mg/L) could enhance the granulation and elevate hydrogen production efficiency. However, an overly-high calcium concentration (300 mg-Ca+2/L) deteriorated the hydrogen productivity. A calcium concentra

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Krakhella, Kjersti, Robert Bock, Odne Burheim, Frode Seland, and Kristian Einarsrud. "Heat to H2: Using Waste Heat for Hydrogen Production through Reverse Electrodialysis." Energies 12, no. 18 (2019): 3428. http://dx.doi.org/10.3390/en12183428.

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This work presents an integrated hydrogen production system using reverse electrodialysis (RED) and waste heat, termed Heat to H 2 . The driving potential in RED is a concentration difference over alternating anion and cation exchange membranes, where the electrode potential can be used directly for water splitting at the RED electrodes. Low-grade waste heat is used to restore the concentration difference in RED. In this study we investigate two approaches: one water removal process by evaporation and one salt removal process. Salt is precipitated in the thermally driven salt removal, thus int

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Umakant N. Rabb, Ambika Shitole, and Archana Kulkarni. "The pH estimation of decoction of hingu (Ferula foetida Regel,), chitraka (Plumbago zeylanica Linn), dhataki (Woodfordia fruticosa kurz), shatavari (Asperagus racemosus willd), shunthi (Zingiber officinale Rosc), maricha (Piper nigrum Linn), gokshura (Tri." International Journal of Science and Research Archive 11, no. 1 (2024): 432–35. http://dx.doi.org/10.30574/ijsra.2024.11.1.0063.

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The pH is measured on a scale of 0-14 with lower values indicating high H+ which is more acidic and higher values indicating H+ ion activity which is less acidic. The pH of 7 is considered as neutral. The acids are the substances that produce free hydrogen ions(H+) when dissolved in water. Bases are substances that produce hydroxyl ions(OH-) when dissolved in water. Acidic solutions are rich in hydrogen ions and basic solutions are poor in hydrogen ions. Some acids dissociate only partly, releasing large amounts of H+ ions, and are called as strong acids. In same way, bases that dissociate par

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Maszelan, Che Nurjulaikha Haji Che, and Azizul Buang. "Monoethanolamine (MEA) Wastewater Treatment Using Photo-Fenton Oxidation." Applied Mechanics and Materials 625 (September 2014): 792–95. http://dx.doi.org/10.4028/www.scientific.net/amm.625.792.

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Monoalkanolamine (MEA) is useful for scrubbing acidic gases such as carbon dioxide (CO2) in flue gas from oil and gas industries. However, small portion of MEA is carried out during the process and being discharged into the wastewater. The organic properties of MEA make it resilience to the conventional wastewater treatment. Photo-Fenton, a potential way of treating the MEA, is a method of producing hydroxyl radical from reaction of ferrous ion, Fe2+and hydrogen peroxide, H2O2with UV light. The hydroxyl radicals will then attack MEA and formed the degradation product. The scope of study is to

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