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Journal articles on the topic 'Amperometric titration'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Golovko, Dmitriy, Virender Sharma, Olga Pavlova, Elena Belyanovskaya, Igor Golovko, Victoria Suprunovich, and Radek Zboril. "Determination of submillimolar concentration of ferrate(VI) in alkaline solutions by amperometric titration." Open Chemistry 9, no. 5 (October 1, 2011): 808–12. http://dx.doi.org/10.2478/s11532-011-0069-8.

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AbstractA new amperometric titration method was developed for quantitative determination of ferrate(VI) (FeVIO42−) in the 7.06×10−5−5.73×10−3 M concentration range. Chromium(III) hydroxide solution was used as the titrant. The diffusion current (Id) had a linear relationship with the concentration of ferrate(VI) and slopes were dependent on the concentration of NaOH. The amperometric titration could detect a lower concentration of ferrate(VI) than could potentiometric and colorimetric titrations. The method was applied successfully to determine concentrations of ferrate(VI), generated electrochemically, in strong alkaline solutions.

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2

Culberson, Charles H., and Shuilong Huang. "Automated amperometric oxygen titration." Deep Sea Research Part A. Oceanographic Research Papers 34, no. 5-6 (May 1987): 875–80. http://dx.doi.org/10.1016/0198-0149(87)90042-2.

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3

Semenova, Ekaterina, Daria Navolotskaya, and Sergey Ermakov. "Interrupted amperometry: the new possibilities in electrochemical measurements." Pure and Applied Chemistry 89, no. 10 (September 26, 2017): 1459–69. http://dx.doi.org/10.1515/pac-2017-0302.

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AbstractInterrupted amperometry is a new highly sensitive method for diffusion current measuring. The main feature of the proposed technique is the use of capacitive current as the analytical signal together with the faradaic current. The conventional electrical circuit for amperometric measurements is complemented by a switcher that enables periodical interruption of the circuit. The technique was successfully applied for direct amperometric determination of lead, cadmium and iron ions, phenol and hydroquinone; for determination of dichromate ion via titration; for determination of dissolved oxygen in water by Clark-type sensor. In all the mentioned cases the achieved values of analytical characteristics are significantly better than for conventional amperometric methods. There are limitations and perspectives of the proposed technique considered.

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4

Hernlem, Bradley J., and Lee-Shin Tsai. "Titration of Chlorine: Amperometric versus Potentiometric." Journal - American Water Works Association 92, no. 12 (December 2000): 101–7. http://dx.doi.org/10.1002/j.1551-8833.2000.tb09075.x.

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5

Schröppel-Meier, G., and W. M. Kaiser. "Amperometric Titration Largely Overestimates Chloride Concentrations in Chloroplast Extracts." Zeitschrift für Naturforschung C 42, no. 9-10 (October 1, 1987): 1109–12. http://dx.doi.org/10.1515/znc-1987-9-1018.

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Determination of chloride contents in aqueously isolated chloroplasts from spinach by amperometric titration indicated chloride concentrations of 60 to 100 mmol 1-1 (based on a chloroplast volume of 25 μl mg-1 chlorophyll). However, when analyzed by anion chromatography, chloride contents in chloroplasts were much lower (1-8 mmol 1-1). In leaf extracts chloride concentrations obtained with both methods were rather similar. Boiling of chloroplast extracts prior to chloride titration reduced indicated chloride contents by a factor of three or four, but did not change results obtained with anion chromatography. It is concluded that chloroplasts contain large amounts of silver complexing agents giving rise to a drastic overestimation of chloroplast chloride concentrations when measured by amperometric titration. Boiling and centrifugation of extracts apparently precipitates these compounds only insufficiently.

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6

Franzini, Vanessa P., Mercedes de Moraes, and José A. Gomes Neto. "Direct Determination of Phosphite in Fertilizers by Amperometric Titration." Journal of Agricultural and Food Chemistry 57, no. 2 (January 28, 2009): 372–74. http://dx.doi.org/10.1021/jf803107x.

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7

IKEDA, Sanae, and Hiromu SATAKE. "Studies on analytical methods by amperometric titration using a rotating platinum electrode. LI. Amperometric titration of methionine and "Methionine sulfoxide" with potassium lodate." NIPPON KAGAKU KAISHI, no. 4 (1986): 538–44. http://dx.doi.org/10.1246/nikkashi.1986.538.

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8

Ahmad Dar, Riyaz, Pradeep Kumar Brahaman, Sweety Tiwari, and Krishna Sadashiv Pitre. "Indirect Electrochemical Analysis of Crocin in Phytochemical Sample." E-Journal of Chemistry 9, no. 2 (2012): 918–25. http://dx.doi.org/10.1155/2012/967079.

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A new electroanalytical method has been developed for the quantitative determination of crocin in a sample of stigmas of saffron (Crocus sativus L.). Crocin is polarographically inactive. However, cysteine in 0.02 M NaCl, pH=5.2±0.01 produces a well defined wave/peak with E1/2/Ep= –0.47/–0.45 V vs. Ag/AgCl. On recording polarograms of a set of solution containing a fixed concentration of cysteine and varying concentrations of crocin under aforesaid experimental conditions a gradual decrease in peak height/diffusion current and a negative shift in peak potential was observed. Thus, indicating cysteine-crocin interaction. Amperometric titration indicated crocin to cysteine ratio of 1:2. The above amperometric titration procedure has been used to determine the concentration of crocin in a sample of saffron. Crystallization process was carried out for the extraction of crocin from dried powder of saffron stigmas. The crystallized crocin was identified by UV-Visible spectrophotometry(at 255 nm and 442 nm) and the quantitative analysis by the developed amperometric method. The concentration of crocin in saffron was found to be 2.13% and purity of isolated crocin 96.81%. The percent recovery varied from 98.56–100.31% and RSD (n=5) of 2.17%.The validation of the proposed procedure for the quantitative assay of crocin was examined via an evaluation of the repeatability, recovery, selectivity and relative standard deviation.

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9

Yahshiyeva, Z., M. Yahshiyeva, and E. Eshonkulov. "Amperometric Titration with Aim of Determination of the Correlation Coefficients." Advanced Science Journal 2014, no. 12 (December 1, 2014): 52–54. http://dx.doi.org/10.15550/asj.2014.12.052.

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10

Niedrig, C., W. Menesklou, S. F. Wagner, and E. Ivers-Tiffée. "High-TemperaturepO2Stability of Metal Oxides Determined by Amperometric Oxygen Titration." Journal of The Electrochemical Society 160, no. 2 (December 6, 2012): F135—F140. http://dx.doi.org/10.1149/2.063302jes.

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11

Niedrig, C., P. Braun, W. Menesklou, S. F. Wagner, and E. Ivers-Tiffee. "Investigation of MIEC Materials Using an Amperometric Oxygen Titration Method." ECS Transactions 45, no. 1 (April 27, 2012): 75–85. http://dx.doi.org/10.1149/1.3701294.

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12

Kozhevnikov, I. V. "A Calculation Method Based on Amperometric Titration with Two Indicator Electrodes." Journal of Analytical Chemistry 59, no. 6 (June 2004): 532–35. http://dx.doi.org/10.1023/b:janc.0000030872.73527.c6.

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13

Mikulski, Ryszard. "Determination of colloidal electrolytes: amperometric titration of dodecylquinolinium bromide with inorganic anions." Analytica Chimica Acta 236 (1990): 325–29. http://dx.doi.org/10.1016/s0003-2670(00)83329-2.

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14

Wygant, Michele B., John A. Statler, and Alan Henshall. "Improvements in Amperometric Detection of Sulfite in Food Matrixes." Journal of AOAC INTERNATIONAL 80, no. 6 (November 1, 1997): 1374–80. http://dx.doi.org/10.1093/jaoac/80.6.1374.

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Abstract Sulfite is added to foods as an antimicrobial, antibrowning agent, or antioxidant. It also can occur naturally, and is often used in the production of beer and wine. For years the standard methodology for determination of sulfite in foods has been the Monier–Williams method, which is a combination of acid distillation and titration. Recently, AOAC adopted a chromatographic method based on a method developed by Kim and Kim for the determination of sulfite. The method combines ion exclusion chromatography with direct-current (DC) amperometric detection to provide more convenient and accurate quantitation of sulfite. However, fouling of the platinum working electrode results in a rapid decrease in method sensitivity. As a result, standards must be injected before and after every sample, and the electrode must be polished frequently to maintain adequate detection limits. Pulsed amperometric detection overcomes electrode fouling problems by repeatedly and continuously applying cleaning potentials to the working electrode. Using this technique, a reproducible electrode surface can be maintained, and injection-to-injection repeatability is greatly improved. A comparison of method performance for both DC and pulsed amperometric detection is presented. Also investigated was the stability of sulfite samples at varying pH, and in the presence or absence of a preservative.

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15

Franklin, Thomas C., and Remi A. Nnodimele. "The amperometric titration of copper(II) sulfate with potassium permanganate in surfactant suspensions." Electroanalysis 6, no. 11-12 (November 1994): 1103–6. http://dx.doi.org/10.1002/elan.1140061131.

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16

SATAKE, Hiromu, and Sanae IKEDA. "Microdetermination of chloride ion in natural water by amperometric titration using chemical amplification." NIPPON KAGAKU KAISHI, no. 12 (1985): 2255–59. http://dx.doi.org/10.1246/nikkashi.1985.2255.

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17

Nair, P. R., K. V. Lohithakshan, Mary Xavier, S. G. Marathe, and H. C. Jain. "Determination of uranium and plutonium in plutonium based fuels by sequential amperometric titration." Journal of Radioanalytical and Nuclear Chemistry Articles 122, no. 1 (May 1988): 19–26. http://dx.doi.org/10.1007/bf02037158.

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18

KANEKO, Hiroyuki, Naoto MIKAMI, and Hitoshi TAIMATSU. "Amperometric Titration of Nitric Monoxide in Inert Gases Using a Zirconia Oxygen Pump-Gauge." Denki Kagaku oyobi Kogyo Butsuri Kagaku 59, no. 6 (June 5, 1991): 478–82. http://dx.doi.org/10.5796/kogyobutsurikagaku.59.478.

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19

Jensen, James N., and J. Donald Johnson. "Interferences by monochloramine and organic chloramines in free available chlorine methods. 1. Amperometric titration." Environmental Science & Technology 24, no. 7 (July 1990): 981–85. http://dx.doi.org/10.1021/es00077a005.

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20

Jensen, James N., and J. Donald Johnson. "Specificity of the DPD and Amperometric Titration Methods for Free Available Chlorine: A Review." Journal - American Water Works Association 81, no. 12 (December 1989): 59–64. http://dx.doi.org/10.1002/j.1551-8833.1989.tb06894.x.

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21

Rievaj, Miroslav, Elena Korgová, and Dušan Bustin. "Electrochemical Study of cis-Dicyanobisethylenediaminechromium(III) Ion and Its Adducts with Hg(II) and Ag(I)." Collection of Czechoslovak Chemical Communications 58, no. 3 (1993): 530–37. http://dx.doi.org/10.1135/cccc19930530.

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Electrochemical properties of [Cr(CN2)(en)2]+ are described. Reactions of this complex with Hg(II) and Ag(I) were studied. Their stoichiometry (1 : 1) was determined using potentiometric and amperometric titration. Different pulse voltammetry (DPV) was applied to identify their products - dinuclear adducts. It was concluded on the bases of DPV experiments that linkage isomerization of bridding cyano ligand occurs in the process of adducts formation. The decomposition (aquation) of these adducts was followed and the influence of H+ and Hg2+ concentration on its rate was measured and discussed. The paper also deals with a spontaneous isomerization of unstable CN linkage isomers Cr(NC)2 and Cr(CN)(CN) to the stable isomer Cr(NC)2.

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22

Turusova, E. V., O. E. Nasakin, and A. N. Lyshchikov. "The use of photogenerated iodine for the determination of isoniazid in solid dosage formulation." Industrial laboratory. Diagnostics of materials 87, no. 3 (March 21, 2021): 5–10. http://dx.doi.org/10.26896/1028-6861-2021-87-3-5-10.

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A shot cut method for the determination of isoniazid in a solid dosage formulation (DF) has been developed. The method is based on isoniazid titration with a solution of photogenerated iodine obtained as a result of irradiation of an auxiliary solution containing potassium iodide, a mixture of sensitizers (sodium eosinate, fluorescein, auramine taken in a molar ratio of 1:1:1) and phosphate buffer solution (pH 7.5). Since the titrant content in the cell was controlled using the voltammetric method (amperometric titration with two polarized electrodes), the interaction of a physiologically active compound with the latter was accompanied by a decrease in the amount of titrant in the cell and, hence, in the current in amperometric circuit. Stabilization of the current in the circuit of the amperometric setup indicated the completeness of the reaction, and, therefore, provided estimation of the content of a physiologically active compound in the dosage formulation. Further irradiation of the solution and measurement of the generation time required to replenish the loss of titrant in the cell also made it possible to regulate the content of isoniazid in the preparation. The technique was tested on the samples of solid dosed formulations. It was shown that the components of the tablet mass (calcium stearate monohydrate, polysorbate, crospovidone and potato starch) do not affect the results of the determination of physiologically active compound provided that the analyzed form is obtained at room temperature. The determined content of isoniazid in a solid dosage formulation varies in the range of 286.0 – 296.0 mg and falls within the range recommended by the General Pharmacopoeia Monograph 1.4.2.0009.15 (285 – 315 mg), which indicates that the quality of the drug meets the GMP standards. The linear dependence of the analytical signal on the concentration of physiologically active compound is observed in the range of 161 – 1610 mg for the drug «Isoniazid. Tablets, 300 mg». The calculated detection limits and quantitative determination are 13.5 and 41.0 mg (both in terms of change in the current strength and in the time of titrant generation), respectively. The developed photochemical method for the determination of isoniazid in solid dosed formulation is easy to use, meets the requirements set out in the guidelines for validation of bioanalytical methods, and does not require expensive equipment. The method can be recommended for routine control of the DF quality indicators in any analytical laboratory.

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23

QUTLIMUROTOVA, Nigora, Salohiddin MAHMADOLIEV, Zulayho SMANOVA, Zuhra YAKHSHIYEVA, and Zhasur TURSUNKULOV. "AMPEROMETRIC DETERMINATION OF CERIUM (III) USING 2,7-DINITROZO-1,8- DIHYDROXYNAPHTHALENE-3,6-DISULFONIC ACID SOLUTION." Periódico Tchê Química 17, no. 36 (December 20, 2020): 735–49. http://dx.doi.org/10.52571/ptq.v17.n36.2020.750_periodico36_pgs_735_749.pdf.

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Cerium and its compounds are widely used in the production of electronic devices and semiconductors, which is why these substances will enter the environment more often in the future. There is a need for effective express methods that can determine the trace amounts of cerium and other rare earth elements with high accuracy to control and study the possible negative impact of cerium compounds on the ecosystems. The objective of this research paper was to elaborate on an express method capable of producing accurate and reliable results on the content of cerium in wastewaters in the presence of other rare earth elements. The elaboration of the express method was carried out based on the amperometric titration method studying the effect of various buffer solutions on cerium determination. Moreover, the effect of strontium, lutetium, iron, yttrium, samarium, niobium, holmium, praseodymium, gadolinium, and erbium ions on acquisition accuracy of the cerium (III) ions in samples of process water was studied. The research results presented a method for the amperometric determination of cerium (III) applying 2,7-dinitroso-1,8-dihydroxynaphthalene-3,6-disulfonic acid on a rotating platinum disk microelectrode. The extraction-amperometric method of analysis was proposed for the analysis of process water. The optimal concentrations of background electrolytes and buffer mixtures and the voltage values, were determined; the stability constant of the complex was calculated; the lower limit of the determined cerium content was defined. No interfering influence of foreign ions on the determination of cerium (III) ions was observed. The developed method for determining cerium (III) has a simpler hardware design than the previously described method of pulsed direct current glow discharge mass spectrometry but has a higher detection limit.

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24

He, Z. K., B. Fuhrmann, and U. Spohn. "Coulometric microflow titrations with chemiluminescent and amperometric detection of the equivalence points — basic investigations and bromimetric titration of low concentration solutions of arsenite." Analytica Chimica Acta 407, no. 1-2 (February 2000): 203–12. http://dx.doi.org/10.1016/s0003-2670(99)00801-6.

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25

Herrera-Gonzalez, Azucena, Javier Arrizon, Maximiliano Bárcena-Soto, Armando Soltero-Martinez, Juan C. Mateos-Diaz, and Norberto Casillas. "Amperometric Titration of Fructan Oligosaccharides of Agave Tequilana Webber, Blue Variety, in a Rotating Disk Electrode." ECS Transactions 36, no. 1 (December 16, 2019): 351–62. http://dx.doi.org/10.1149/1.3660629.

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26

SATAKE, Hiromu, and Sanae IKEDA. "Amperometric titration of micro amounts of methionine in the presence of methionine sulfoxide with potassium iodate in sulfuric acid-potassium bromide media." Bunseki kagaku 36, no. 2 (1987): T15—T19. http://dx.doi.org/10.2116/bunsekikagaku.36.2_t15.

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27

Ammar, T. A., K. Y. Abid, A. A. El-Bindary, and A. Z. El-Sonbati. "Comparison of commercial analytical techniques for measuring chlorine dioxide in urban desalinated drinking water." Journal of Water and Health 13, no. 4 (July 14, 2015): 970–84. http://dx.doi.org/10.2166/wh.2015.012.

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Most drinking water industries are closely examining options to maintain a certain level of disinfectant residual through the entire distribution system. Chlorine dioxide is one of the promising disinfectants that is usually used as a secondary disinfectant, whereas the selection of the proper monitoring analytical technique to ensure disinfection and regulatory compliance has been debated within the industry. This research endeavored to objectively compare the performance of commercially available analytical techniques used for chlorine dioxide measurements (namely, chronoamperometry, DPD (N,N-diethyl-p-phenylenediamine), Lissamine Green B (LGB WET) and amperometric titration), to determine the superior technique. The commonly available commercial analytical techniques were evaluated over a wide range of chlorine dioxide concentrations. In reference to pre-defined criteria, the superior analytical technique was determined. To discern the effectiveness of such superior technique, various factors, such as sample temperature, high ionic strength, and other interferences that might influence the performance were examined. Among the four techniques, chronoamperometry technique indicates a significant level of accuracy and precision. Furthermore, the various influencing factors studied did not diminish the technique's performance where it was fairly adequate in all matrices. This study is a step towards proper disinfection monitoring and it confidently assists engineers with chlorine dioxide disinfection system planning and management.

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28

Turusova, E. V., and O. E. Nasakin. "Using of photogenerated iodine for determination of 1,1-dimethylhydrazine in environmental objects." Industrial laboratory. Diagnostics of materials 86, no. 4 (April 23, 2020): 21–28. http://dx.doi.org/10.26896/1028-6861-2020-86-4-21-28.

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A photochemical method for determination of 1,1-dimethylhydrazine H2NN(CH3)2 (unsymmetrical dimethylhydrazine (UDMH)) based on titration of the analyte with photogenerated iodine obtained by irradiation of an auxiliary solution containing potassium iodide and a mixture of sensitizers (EOSIN Y:auramine:fluorescein taken in a molar ratio 1:1:1) in an acetate medium (pH 6) has been developed. With increasing acidity, a decrease in the rate of photogeneration is observed which is most likely attributed to disproportionation of the resultant titrant. Since the titrant (iodine) content is controlled by the voltammetric method, the photochemical titration of UDMH is accompanied by a decrease in the current strength in the circuit of the amperometric setup and stabilization indicates the completeness of the reaction. Measurements of the photogeneration time necessary to compensate for the loss of titrant in the cell upon further irradiation of the solution in the presence of atmospheric oxygen provide quantitative assessing of the UDMH content in environmental objects. Since the analyte interacts with the titrant in a molar ratio 1:2, we suggest the possibility of UDMH oxidation to NDMA (N-nitrosodimethylamine). A photochemical method of UDMH determination in solution is thus developed with the detection and determination limits (0.49 and 1.62) μg/ml, respectively. Unfortunately, the sensitivity of the proposed methodology does not allow determination of a toxic chemical contaminant at the MPC level which necessitates preconcentration of the mobile forms of UDMH by steam distillation in a 40 % sodium hydroxide solution. The developed methodology matches the validation parameters by the indices of linearity, ranking, correctness and thus can be recommended for determination of the UDMH content in any analytical laboratory. The photochemical method was tested in the analysis of soil samples taken from background and contaminated territories as well as natural water. A slight excess of the UDMH content has been found in the soil taken from the former location of the military unit.

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29

Kolthoff, I. M., and H. A. Laitinen. "Amperometric titrations. III. The location of the minimum in amperometric titrations with regard to the equivalence point." Recueil des Travaux Chimiques des Pays-Bas 59, no. 10 (September 3, 2010): 922–28. http://dx.doi.org/10.1002/recl.19400591002.

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Fish, William, and François M. M. Morel. "Propagation of error in fulvic acid titration data: a comparison of three analytical methods." Canadian Journal of Chemistry 63, no. 6 (June 1, 1985): 1185–93. http://dx.doi.org/10.1139/v85-202.

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Many methods have been employed for measuring the interactions of trace metals and humic materials but little consideration has been given to the magnitude of error in the resulting titration data. Most common metal-titration methods can be placed into one of three categories based on the chemical species that is most directly measured: free ionic metal, total labile metal, or ligand-bound metal. The propagation of random instrument error into a titration data set is not uniform throughout a titration and the pattern of propagation is shown to be characteristic of the category of method used. Standard deviations are determined for measurements by ion-selective electrodes, fluorescence quenching, and fixed potential amperometry (each representative of a category of methods). Error propagation in resulting titration data is quantified. No single titration method yields uniformly precise data in all concentration ranges and a combination of complementary methods yields the best characterization of metal binding to a humic material.

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31

Tagirova, Zarema G. "THE IMPORTANCE OF THE FUNCTIONAL STATE OF THIOL-DISULFIDE UNIT OF THE ANTIOXIDANT SYSTEM IN THE ACUTE BACTERIAL DYSENTERY IN THE FORECAST OF THE COURSE AND THE SELECTION OF THE TREATMENT REGIMEN." Epidemiology and Infectious Diseases 22, no. 5 (October 15, 2017): 258–63. http://dx.doi.org/10.17816/eid41012.

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The goal was to optimize the treatment of shigellosis patients on the basis of an evaluation of the functional state of the thiol-disulfide unit of the antioxidant system (AOS) on a background of various treatment methods. Materials and methods. 400 patients with acute bacterial dysentery of varying severity of the course were observed; Shigella Flexner was isolated in 324(81%) cases, Shigella Sonne - in 76(19%) cases. The determination of sulfhydryl (SH-) groups and disulfide bonds (SS-) was carried out by the direct and reverse amperometric titration with the use of silver nitrate and unithiol in hemolysate. Three groups separated by random sampling were considered. In group I (122 patients), basic therapy was prescribed, including etiotropic and pathogenetic treatment. In group II (134 patients), pathogenetic treatment was prescribed in the combination with a complex of natural cytokines and antimicrobial peptides secreted by pig peripheral blood leukocytesa (»superlimph» preparation). In the third group (144 patients), the drug «superlimph» was prescribed along with etiotropic and pathogenetic treatment. Results. In acute bacterial dysentery disturbances of the redox balance were established to be correlated with the severity of the course in the form of a significant decrease in the level of SH-groups and the thiol-disulfide coefficient on the background of an increase in the level of SS-groups, which indicates to a decrease in the buffer capacity of the AOS. These data can serve as predictors of the nature of the course of dysentery. Comparative clinical evaluation of the effectiveness of various treatment methods revealed the most pronounced in severe disease advantages of complex therapy, including a combination of basic etiotropic, pathogenetic treatment with a complex of natural cytokines and antimicrobial peptides («superlimph»). Conclusion. The change in the ratio of oxidative processes to AOS occurs at any severity of dysentery, but in severe cases these changes acquire a qualitative character. In the survey standards for bacterial dysentery there is recommended to include the determination of indices of the thiol-disulfide unit, as an additional criterion for the severity of the course and the prognosis of the course of the disease. Exceeding the concentration of SS-groups of the concentration of SH-groups and the inversion of the thiol-disulfide coefficient as markers of the breakdown in AOS seem to be prognostically unfavorable factor. The severe course of acute bacterial dysentery is an indication for inclusion of antioxidant agents in the therapeutic complex. Based on the mechanism of revealed abnormalities in AOS, the use of a complex of natural cytokines and antimicrobial peptides («superlimph») can be considered as an immunocorrecting drug.

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32

He, Z. K., B. Fuhrmann, and U. Spohn. "Coulometric microflow titrations with chemiluminescent and amperometric equivalence point detection." Analytica Chimica Acta 409, no. 1-2 (March 2000): 83–91. http://dx.doi.org/10.1016/s0003-2670(99)00890-9.

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33

Antonietta Baldo, M., Salvatore Daniele, Carlo Bragato, and Gian A. Mazzocchin. "Amperometric end-point detection of complexometric titrations with platinum microelectrodes." Analyst 124, no. 7 (1999): 1059–63. http://dx.doi.org/10.1039/a903144h.

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34

Jovanović, Ljiljana S., Nikola J. Ević, Luka J. Bjelica, and Ferenc F. Gaál. "Three-electrode amperometric titrations of some Fe(III) chelate complexes." Microchemical Journal 38, no. 3 (December 1988): 343–49. http://dx.doi.org/10.1016/0026-265x(88)90044-6.

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35

Bendikov, Tatyana A., and Chaim N. Yarnitzky. "AUTOMATED TITRATIONS WITH AN ALTERNATE FLOW, LINEAR SPEED, VARIATION SYSTEM. APPLICATIONS TO AMPEROMETRIC, BIAMPEROMETRIC, AND SPECTROPHOTOMETRIC TITRATIONS." Instrumentation Science & Technology 30, no. 4 (January 11, 2002): 371–86. http://dx.doi.org/10.1081/ci-120015446.

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36

Badwan, Adnan A., Omar A. Jawan, and Lina Owais. "Metoclopramide determination by amperometric and potentiometric titrations—application to some pharmaceutical preparations." International Journal of Pharmaceutics 28, no. 1 (January 1986): 41–46. http://dx.doi.org/10.1016/0378-5173(86)90145-6.

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WATANABE, Takaho, Masaharu TANAKA, Shu-ming CHEN, Chang-quig LIN, Yoshihiro YOSHIMURA, Katsumi UCHIYAMA, Keiko OHSAWA, and Kazuo IMAEDA. "Determination of chlorine oxides by amperometric titrator using current-integration method." Bunseki kagaku 40, no. 12 (1991): T221—T226. http://dx.doi.org/10.2116/bunsekikagaku.40.12_t221.

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HOJO, Masashi, and Yoshihiko IMAI. "Amperometric titrations of acyclic polyamines at dropping mercury electrode with strong acids in acetonitrile." Analytical Sciences 2, no. 1 (1986): 21–23. http://dx.doi.org/10.2116/analsci.2.21.

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Potter, E. C., and G. E. Everitt. "Further advances in dissolved oxygen micro analysis. I. Small-scale water sampling vessels and amperometric titrations." Journal of Applied Chemistry 9, no. 12 (May 4, 2007): 642–45. http://dx.doi.org/10.1002/jctb.5010091203.

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Catandi, G., Y. Obeidat, A. Chicco, T. Chen, and E. Carnevale. "167 Basal and maximal oxygen consumption of oocytes from young and old mares." Reproduction, Fertility and Development 31, no. 1 (2019): 208. http://dx.doi.org/10.1071/rdv31n1ab167.

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Mitochondria play a critical role in oocyte developmental competence by providing energy to the oocyte through oxidative phosphorylation. We hypothesised that oxygen consumption, a measure of mitochondrial function, would be lower in the oocytes of old versus young mares as a potential mechanism of reduced developmental competence associated with equine aging. To test this hypothesis, we used a novel electrochemical sensor device to compare basal and maximal oxygen consumption rates of oocytes obtained from mares aged 6 to 12 years (Young, n=8 from 7 mares) and=20 years (Old, n=12 from 8 mares). Cumulus-oocyte complexes (COC) were collected by transvaginal, ultrasound-guided follicular aspirations of dominant follicles (35mm) during oestrus and at 16±2h after induction of follicular maturation (2000IU of hCG and 0.75mg of deslorelin acetate). Recovered COC were incubated in medium [TCM-199; Life Technologies, Grand Island, NY, USA) with 10% fetal calf serum, 25mg mL−1 gentamicin, and 0.2mM pyruvate] at 38.5°C in 5% CO2 and air for 26±2h. After maturation, COC were stripped of cumulus cells and checked for the presence of an extruded polar body before electrochemical measurements using amperometry. A microchamber with a 3-electrode system (working, counter, and reference electrodes) was filled with 120µL of medium (G-MOPS™, Vitrolife, Englewood, CO, USA) and overlaid with 120µL of paraffin oil (OVOIL™, Vitrolife). The baseline current was measured before adding the oocyte through the oil layer and over the centre of the working electrode. Oxygen consumption was monitored as the linear decrease in the oxygen reduction current over time, which was converted to femtomoles of O2 consumed per second (fmol s−1) using a calibration curve for the sensor. Basal (nonstimulated) oxygen consumption was measured for 5min, followed by assessment of maximal noncoupled respiratory capacity obtained by titrating 1 µM carbonyl cyanide m-chlorophenyl hydrazone (CCCP) at 8-min intervals. The highest value observed during CCCP titrations was considered the maximal oxygen consumption. Two-tailed Student’s t-tests were used to analyse data. Oocytes from young mares had higher basal oxygen consumption compared with old mares, respectively (mean±s.e.m., 1.74±0.18 and 1.27±0.09 fmol s−1; P=0.04) as well as higher maximal oxygen consumption (2.67±0.19 and 2.05±0.12 fmol s−1; P=0.016). Mitochondrial efficiency (maximal/basal oxygen consumption) was not different for Young and Old, respectively (1.62±0.13 and 1.65±0.07; P=0.9). In summary, we used a novel electrochemical sensor device to measure basal and maximal oxygen consumption of oocytes and to confirm our hypothesis that aging impairs mitochondrial respiratory capacity in equine oocytes, which may contribute to age-associated changes in equine fertility.

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Turusova, E. V. "The use of photogenerated iodine in determination of the dibazol content in solid and liquid dosage formulations." Industrial laboratory. Diagnostics of materials 87, no. 2 (February 16, 2021): 19–24. http://dx.doi.org/10.26896/1028-6861-2021-87-2-19-24.

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A rapid method for the determination of Dibazol (bendazol hydrochloride) in liquid and solid dosage forms (DF) has been developed. The method is based on converting the drug into an analytical form and titrating the physiologically active compound (PAC) with a solution of photogenerated iodine obtained by irradiation of an auxiliary solution containing potassium iodide, a mixture of sensitizers (sodium eosinate: fluorescein: auramine, taken in a molar ratio of 1:1:1) and an acetate buffer solution (pH 5.6). A decrease in the titrant content in the cell due to interaction with Dibazol was recorded by a decrease in the current in the amperometric circuit. Stabilization of the current in the circuit indicated the completeness of the reaction, thus providing for estimation of the PAC content in a DF. Further irradiation of the solution and measurement of the generation time required to replenish the titrant loss in the cell also ensure the quantitative estimation of the PAC content in the preparation. The method has been tested on solid dosage form and sterile solutions of Dibazol intended for intramuscular and intravenous administration. A slight effect of stabilizers (hydrochloric acid, ethanol) and auxiliary substances (potato starch) present in the DF on the photogeneration of the titrant was observed. The determined Dibazol content in solid and liquid DF falls within the range recommended by the order of the Ministry of Health of the Russian Federation (26.10.2015 No. 751n) and OFS.1.4.2.0009.15, which indicates that the quality of the drug meets the GMP standards. The linear dependence of the analytical signal on the Dibazol concentration is observed in the range of 13.5 – 134.7 mg for the drug «Dibazol-UBF, tablets, 20 mg». The calculated limits of Dibazol detection and quantitative determination by changes in the current strength and generation time are (4.71; 3.56) and (14.26; 10.77) mg, respectively. The use of developed technique in the analysis of drugs containing Dibazol reduces both the time of single determination due to the absence of the need for standardization of solutions, and the cost of a single analysis, since it does not require the use of expensive equipment and reagents.

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"The role of the 2,7-dinitrozo-1,8-dihydroxynaphthalene-3,6-disulfonic acid reagent in determining the thorium ion (IV)." CHEMISTRY AND CHEMICAL ENGINEERING, April 25, 2021, 54–58. http://dx.doi.org/10.51348/mhsa3146.

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The aim is to develop a method for the amperometric determination of thorium (IV) ion with 2,7-dinitroso-1,8-dihydroxynaphthalene-3,6-disulfoxyl reagent. Methods of amperometric determination of thorium by solution of 2,7-dinitrozo-1,8-dihydroxynaphthalene-3,6-disulfonic acid on different acid-base properties of background electrolytes and buffer mixtures are considered. The half-wave potential of new reagent was found by logarithmic analysis equal 0.72 V at pH 2.82, which once again indicates on the irreversibility of the process of electrooxidation of the studied organic reagent in used acid-base medias. The conditions for amperometric titration of thorium are optimized, and the influence of outside accompanying metals on the shape of curves and the results of its determination are investigated.

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"Investigation of MIEC Materials Using an Amperometric Oxygen Titration Method." ECS Meeting Abstracts, 2012. http://dx.doi.org/10.1149/ma2012-01/8/404.

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Yakhshieva, Z., S. D. Dzhuraeva, K. B. Rakhmatov, and S. Khozhieva. "AMPEROMETRIC TITRATION OF MERCURY (II) WITH MPCMDEDTC SOLUTION IN DIMETHYL SULFOXIDE." Austrian Journal of Technical and Natural Sciences, December 9, 2019, 58–60. http://dx.doi.org/10.29013/ajt-19-9.10-58-60.

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Rakhmatov, K. B., S. D. Dzhuraeva, H. D. Ismoilova, E. N. Dustkabilov, and E. A. Rakhmatov. "AMPEROMETRIC TITRATION OF MERCURY (II) WITH MPHCMDEDTC – A NITROGEN-AND-SULFUR-CONTAINING REAGENT." European Science Review, June 9, 2019, 129–32. http://dx.doi.org/10.29013/esr-19-3.4-129-132.

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Rakhmatov, K. B., F. B. Zhavliev, O. E. Kuybokarov, A. I. Abdirazzakov, and E. N. Dustkabilov. "AMPEROMETRIC TITRATION OF PALLADIUM (II) AND PLATINUM (IV) IONS IN INDIVIDUAL SOLUTIONS OF VINYLPYRIMIDINE." European Science Review, June 9, 2019, 133–34. http://dx.doi.org/10.29013/esr-19-3.4-133-134.

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