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Journal articles on the topic 'Conductometric titration'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Bindewald, Eduardo Henrique, João Carlos Rosa-Sobrinho, Márcio Fernando Bergamini, and Luiz Humberto Marcolino-Júnior. "Simple, fast and inexpensive method for determination of ranitidine hydrochloride based on conductometric measurements." Eclética Química Journal 43, no. 4 (December 5, 2018): 37. http://dx.doi.org/10.26850/1678-4618eqj.v43.4.2018.p36-42.

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This work aims the development and optimization of an alternative method for ranitidine hydrochloride (RAN-HCl) determination. The proposed method was based on conductometric titration of RAN by precipitation of AgCl solid using a solution of AgNO3 as titrant. It was investigated the possibility of performing the titrations on hydroalcoholic and deionized water medium. A limit of detection of 1.0 mmol L-1 and 0.5 mmol L-1 were achieved for RAN titration in deionized water and in a 75:25 hydroalcoholic mixture, respectively. Such behavior is attributed to the dielectric constant of hydroalcoholic medium, which is lower than aqueous solution, making AgCl more insoluble and improving the resolution of the conductivity curve around the end point. Therefore, it is concluded that the conductometric titration method to determine RAN using AgNO3 as titrant proved to be feasible at low drug concentrations. The statistical calculations for obtained results suggested good precision for the conductometric method. According to t-test, there were no significant differences between found values at a 95% confidence level. Moreover, obtained results showed an excellent performance of the proposed method on quality control of RAN-HCl in generic formulations without any sample pretreatment.

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2

Bindewald, Eduardo Henrique, João Carlos Rosa-Sobrinho, Márcio Fernando Bergamini, and Luiz Humberto Marcolino-Júnior. "Simple, fast and inexpensive method for determination of ranitidine hydrochloride based on conductometric measurements." Eclética Química Journal 43, no. 4 (January 7, 2019): 37. http://dx.doi.org/10.26850/1678-4618eqj.v43.4.2018.p37-43.

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This work aims the development and optimization of an alternative method for ranitidine hydrochloride (RAN-HCl) determination. The proposed method was based on conductometric titration of RAN by precipitation of AgCl solid using a solution of AgNO3 as titrant. It was investigated the possibility of performing the titrations on hydroalcoholic and deionized water medium. A limit of detection of 1.0 mmol L-1 and 0.5 mmol L-1 were achieved for RAN titration in deionized water and in a 75:25 hydroalcoholic mixture, respectively. Such behavior is attributed to the dielectric constant of hydroalcoholic medium, which is lower than aqueous solution, making AgCl more insoluble and improving the resolution of the conductivity curve around the end point. Therefore, it is concluded that the conductometric titration method to determine RAN using AgNO3 as titrant proved to be feasible at low drug concentrations. The statistical calculations for obtained results suggested good precision for the conductometric method. According to t-test, there were no significant differences between found values at a 95% confidence level. Moreover, obtained results showed an excellent performance of the proposed method on quality control of RAN-HCl in generic formulations without any sample pretreatment.

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3

Prasad, S., V. D. Leite, R. A. C. Santana, and E. A. Medeiros. "Electrometric studies on formation of cerium vanadates as a function of pH." Eclética Química 31, no. 2 (2006): 31–38. http://dx.doi.org/10.1590/s0100-46702006000200005.

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The precise nature of the reaction between nitric acid and sodium ortho-vanadate solutions has been studied by means of electrometric techniques involving potentiometric and conductometric titrations. The well defined inflections and breaks in the titration curves confirm the existence of the anions, pyro-V2O7(4-), meta-VO3- and poly-H2V10O28(4-) corresponding to the ratios of VO4(3-):H+ as 1:1, 1:2 and 1:2.6 in the neighborhood of pH 10.5, 7.4 and 3.6, respectively. The interaction of cerium(III) nitrate with sodium vanadate solutions, at specific pH levels 12.4, 10.5, 7.4 and 3.6 was also studied by potentiometric and conductometric titrations between the reactants. The end-points obtained from the sharp inflections in the titration curves provide definite evidence for the formation and precipitation of cerium ortho-Ce2O3.V2O5, pyro-2Ce2O3.3V2O5 and meta-Ce2O3.3V2O5 vanadates in the neighborhood of pH 7.4, 6.2 and 4.8, respectively. Analytical investigations on the precipitates formed confirm the results of the electrometric study.

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4

Calatayud, J. Matrtinez, P. Campins Falcó, and M. C. Pascual Martí. "Conductometric Titration of Chlorhexidine and Proguanil." Analytical Letters 19, no. 11-12 (January 1986): 1311–21. http://dx.doi.org/10.1080/00032718608066303.

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5

CHENG, JIANLI, JING SUN, HAOOIANG LIN, and DEOING WEI. "Conductometric titration studying on hollow microspheres preparation." Polimery 51, no. 09 (September 2006): 643–47. http://dx.doi.org/10.14314/polimery.2006.643.

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6

Abu Ghalwa, Nasser. "Development of a Novel Solid-State Sensor Electrode Based on Titanium Thin Film as an Indicator Electrode in Potentiometric and Conductometric Acid-Base Titration in Aqueous Solution." Journal of Sensors 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/681826.

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A modified Ti/(SnO2+ Sb2O3) electrode was prepared by thermal deposition on titanium substrate and its use as indicator electrode to potentiometric and conductometric acid-base titration in aqueous solution at 298 K was developed. The E-pH curve is linear with slope of 0.0512 V/dec at 298 K. The standard potential of this electrode,E0, was determined with respect to the SCE as reference electrode. The recovery percentages for potentiometric and conductometric acid-base titration for acetic acid against NaOH were calculated. The cell constant, specific conductance, and the molar conductance with dilution for some common electrolytes were measured.

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7

Prasad, S., R. A. C. Santana, A. R. N. Campos, and V. D. Leite. "Potentiometric and conductometric studies on the system acid-isopolytungstate and the formation of lanthanum tungstates." Eclética Química 32, no. 1 (2007): 71–78. http://dx.doi.org/10.1590/s0100-46702007000100010.

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The stoichiometry of the polyanions formed by the action of nitric acid on sodium tungstate (< 0.01M) has been studied by means of electrometric techniques involving pH-potentiometric and conductometric titrations. The well defined inflections and breaks in the titration curves provide evidence for the existence of the polyanions, para-W12O41(10-) and meta-W12O39(6-) corresponding to the ratio of H+:WO4(2-) as 7:6 and 9:6 in the pH ranges 5.7-6.0 and 3.6-4.1, respectively. The interaction of lanthanum nitrate with sodium tungstate solutions, at specific pH levels 8.0, 5.9 and 4.0 was also studied by pH and conductometric titrations, in aqueous and alcoholic media, with each of the reagents alternatively used as titrant. The electrometric experiments provide definite evidence of the formation of normal-La2O3.3WO3, para-5La2O3.36WO3 and meta-La2O3.12WO3 tungstates in the vicinity of pH 6.3, 5.0 and 4.2, respectively. Analytical investigations on the precipitates formed confirm the results of the electrometric study.

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8

Sartori, Elen Romão, Nathália Vieira Barbosa, Ronaldo Censi Faria, and Orlando Fatibello-Filho. "Conductometric determination of propranolol hydrochloride in pharmaceuticals." Eclética Química 36, no. 1 (2011): 110–22. http://dx.doi.org/10.1590/s0100-46702011000100008.

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In this paper the conductometric titration of propranolol hydrochloride in pharmaceutical formulations using silver nitrate as titrant is proposed. The method was based on the formation of an insoluble salt (AgCl(s)) between the chloride of propranolol hydrochloride molecule and Ag(I) ions of the titrant AgNO3. The effect of the PROP-AgNO3 concentrations and the interval of time between the successive additions of the titrant on the shape of the titration curve were studied. The obtained recoveries for four samples ranged from 96.8 to 105%. The proposed method was successfully applied in the determination of propranolol hydrochloride in several pharmaceutical formulations, with results in close agreement at a 95 % confidence level with those obtained using official spectrophotometric method.

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9

Romão Sartori, Elen, Nathália Vieira Barbosa, Ronaldo Censi Faria, and Orlando Fatibello-Filho. "Conductometric determination of propranolol hydrochloride in pharmaceuticals." Eclética Química Journal 36, no. 1 (October 31, 2017): 110. http://dx.doi.org/10.26850/1678-4618eqj.v36.1.2011.p110-122.

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In this paper the conductometric titration of propranolol hydrochloride in pharmaceutical formulations using silver nitrate as titrant is proposed. The method was based on the formation of an insoluble salt (AgCl(s)) between the chloride of propranolol hydrochloride molecule and Ag(I) ions of the titrant AgNO3. The effect of the PROP-AgNO3 concentrations and the interval of time between the successive additions of the titrant on the shape of the titration curve were studied. The obtained recoveries for four samples ranged from 96.8 to 105%. The proposed method was successfully applied in the determination of propranolol hydrochloride in several pharmaceutical formulations, with results in close agreement at a 95 % confidence level with those obtained using official spectrophotometric method.

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10

H. Hasan, Shlear, Nabeel S. Othman, and Kafia M. Surchi. "Determination of Phenylephrine-HCl Using Conductometric Titration Method." Current Analytical Chemistry 12, no. 4 (July 1, 2016): 330–34. http://dx.doi.org/10.2174/1573412912666151126205443.

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11

Zwetsloot, J. P. H., and J. C. Leyte. "Conductometric Titration of Latex with Acidic Surface Groups." Journal of Colloid and Interface Science 163, no. 2 (March 1994): 362–71. http://dx.doi.org/10.1006/jcis.1994.1115.

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12

Poliuzhyn, I. P., F. I. Tsiupko, M. M. Laruk, O. O. Yurin, and R. R. Guminilovych. "Рotentiometric and conductometric determination of amine and acid numbers of reaction mixture from fatty acid amidation." Chemistry, Technology and Application of Substances 4, no. 1 (June 1, 2021): 8–18. http://dx.doi.org/10.23939/ctas2021.01.008.

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The possibility of simultaneous potentiometric and conductometric titration is considered for determination of the acid (A.N.) and amine (AM.N.) numbers of the amidation reaction mixture for technical fatty acids (F.A.) by diethylenetriamine (DETA). Interpretation of titration curves was performed on the basis of model mixtures for DETA and F.A. industrial sample. The obtained results indicate the possibility of determining A.N. and AM.N. values by sequential titration of one sample for industrial organic products and amidation reaction mixtures.

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13

Forizs, E., and Cs Muzsnay. "Conductometric titration of thiosulfate using new-type conductivity cells." Talanta 43, no. 10 (October 1996): 1639–42. http://dx.doi.org/10.1016/0039-9140(96)01884-x.

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14

Lanzing, J. C., and L. J. van der Wolk. "The conductometric titration of phosphoric acid with caustic soda." Recueil des Travaux Chimiques des Pays-Bas 48, no. 1 (September 3, 2010): 83–92. http://dx.doi.org/10.1002/recl.19290480109.

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15

Evstratova, K. I., T. Yu Ivanovskaya, and I. V. Kucheryavaya. "Complexometric-conductometric titration analysis of drugs and food additives." Pharmaceutical Chemistry Journal 33, no. 12 (December 1999): 675–79. http://dx.doi.org/10.1007/bf02974947.

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16

Baulin, V. E., G. S. Tsebrikova, D. V. Baulin, and Y. F. Al Ansary. "1,5-bis[2-(dioxyphosphoryl)-4-ethylphenoxy]-3-oxapentane and its Analogs as Promising Organic Ligands for Copper(II) Binding s." Biomedical Chemistry: Research and Methods 1, no. 3 (2018): e00043. http://dx.doi.org/10.18097/bmcrm00043.

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The dissociation and complexation ability toward Cu(II) of acidic type phosphoryl-containing podands – tetrabasic 1,5-bis[2-(dioxyphosphoryl)-4-ethylphenoxy]-3-oxapentane (L1), dibasic – 1,5-bis[2-(ethoxyhydroxyphosphoryl)-4-ethylphenoxy]-pentane (L2) and also of their carboxylic analogue dibasic 1,5-bis[2-(oxycarbonylphenoxy)]-3-oxapentane (L3) were investigated by spectrophotometric, conductometric and potentiometric methods in water in the presence 5% of dimethyl formamide. Spectrophotometric and conductometric titration data provided evidence for formation of 1:1 (M:L) complexes. The dissociation constants were determined and species distribution diagrams for studied acids were obtained by potentiometric method. These data are of interest for the design of binary extragents and medicinal drugs based on the studied ligands. The stability constants of Cu(II) 1:1 (M:L) complexes were estimated. Analysis of the titration curves suggests that deprotonation forms of the studied ligands react with Cu2+. Substitution of carboxylic groups in acyclic polyesters by phosphonic results in increased stability of the copper(II) complexes

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17

Obradovic, Mirjana, Slavica Sunaric, Snezana Mitic, and Dragan Veselinovic. "Conductometric and pH metric investigations of the oxalic acid and NaAsO2 reaction." Journal of the Serbian Chemical Society 73, no. 11 (2008): 1113–22. http://dx.doi.org/10.2298/jsc0811113o.

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The reaction between NaAsO2 and oxalic acid was studied by pH-metric and conductometric measurements, applying the methods of continual variation and pH-metric and conductometric titration. It was found that oxalic acid forms a complex anion of the type [AsOC2O4]-. The relative stability constant of the complex at ionic strengths, I, of 0.10 (log Kr = 4.70), 0.20 (log Kr=4.51), 0.50 (log Kr = 4.24) and 0 (log K 0 = 5.05) and thermodynamic parameters were calculated using the data obtained by pH-metric measurements at 25.0?0.1?C (DH = 10.5 kJ mol-1, DG = -29.0 kJ mol-1, DS = 133 J mol-1 K-1).

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18

Garcia, Jennifer, and Linda D. Schultz. "Determination of Sulfate by Conductometric Titration: An Undergraduate Laboratory Experiment." Journal of Chemical Education 93, no. 5 (February 11, 2016): 910–14. http://dx.doi.org/10.1021/acs.jchemed.5b00941.

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19

Stubbs, Jeffrey M., Patrice Roose, Patrick De Doncker, and Donald C. Sundberg. "Probing the Surface of Polymer Colloids by Conductometric Surfactant Titration." Langmuir 22, no. 6 (March 2006): 2697–705. http://dx.doi.org/10.1021/la052721n.

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20

NAKAGAWA, Yoshinori, Toshiko SUDA, and Hiroshi TERADA. "Determination of cyanine dye Platonin by conductometric titration with tetraphenylborate." Bunseki kagaku 34, no. 1 (1985): 40–43. http://dx.doi.org/10.2116/bunsekikagaku.34.40.

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21

YOSHIMURA, Chozo, Takayosi HUZINO, and Tadashi OHNISHI. "Conductometric titration of metal chelate with EDTA in nonaqueous media." Bunseki kagaku 37, no. 4 (1988): 169–73. http://dx.doi.org/10.2116/bunsekikagaku.37.4_169.

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22

Patel, M. G., K. R. Desai, and H. S. Patel. "Synthesis and Characterization of Colored Polyureas." E-Journal of Chemistry 1, no. 1 (2004): 51–56. http://dx.doi.org/10.1155/2004/812751.

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Various disperse dyes based onm-phenylenediamine have been prepared. These dyes then polycondensation with 4,4'-Diphenyl methane diisocyanate. The resultant colored polyureas were characterized by N content, IR spectral studies, Number Average Molecular Weight (Mn) estimation by nonaqueous conductometric titration and thermogravimetry. All the polyureas were subjected to measure electrical conductivity at room temperature.

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23

Patel, K. B., K. R. Desai, and H. S. Patelk. "Communication." High Performance Polymers 9, no. 4 (December 1997): 457–60. http://dx.doi.org/10.1088/0954-0083/9/4/009.

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Four various poly(urethane-urea)s (PUUs) were prepared by polycondensation of 3-aminophenol with various diisocyanates. The resultant poly(urethane-urea)s were characterized by elemental analyses, IR spectral studies, number average molecular weight ( Mn) estimated by non-aqueous conductometric titration and thermogravimetry. The electrical properties of these polymers have also been measured at room temperature.

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24

Rusu, Olimpia, Maria Pleniceanu, Mihaela Mureseanu, Al Popescu, and Ioana Mitrache. "NEW Cr(III) COMPOUNDS IN ANALYTICAL CHEMISTRY. Bi(III) CONDUCTOMETRIC DETERMINATION." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 9, no. 10 (December 20, 2001): 63–67. http://dx.doi.org/10.48141/sbjchem.v9.n10.2001.65_2001.pdf.

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This study presents the synthesis and characterization of the complex [Bi(Rhodanine)3][Cr(NCS)4(Aniline)2]3. The new complex was analyzed by thermogravimetric, oxidation, infrared, and other spectrometric techniques and was used for the determination of bismuth in drugs. The dosage of Bi(III) in Ulcerotrat was done by conductometric titration with rhodanine and complex anions of Cr(III), respectively.

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25

Selitrenikov, Alexey V., Yuri E. Zevatskii, and Denis V. Samoylov. "METHOD OF DATA PROCESSING OF CONDUCTOMETRIC TITRATION IN WATER-ORGANIC MEDIA." Bulletin of the Saint Petersburg State Institute of Technology (Technical University) 54(80) (2020): 3–14. http://dx.doi.org/10.36807/1998-9849-2020-54-80-3-14.

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26

Selitrenikov, A. V., and Yu E. Zevatskii. "Study of acid-base properties of weak electrolytes by conductometric titration." Russian Journal of General Chemistry 85, no. 1 (January 2015): 7–13. http://dx.doi.org/10.1134/s1070363215010028.

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27

YOSHIMURA, Chozo, and Yoshinobu YAGITA. "Conductometric titration of metal-cupferron chelate with EDTA in nonaqueous media." Bunseki kagaku 38, no. 6 (1989): 267–71. http://dx.doi.org/10.2116/bunsekikagaku.38.6_267.

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28

van Nieuwenburg, C. J. "On the simultaneous conductometric titration of sulphuric acid and nitric acid." Recueil des Travaux Chimiques des Pays-Bas 57, no. 6 (September 3, 2010): 616–19. http://dx.doi.org/10.1002/recl.19380570610.

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29

YOSHIMURA, Chozo, and Tadashi OHNISHI. "Conductometric titration of metal-8-quinolinol chelate with EDTA in nonaqueous media." Bunseki kagaku 35, no. 10 (1986): 839–43. http://dx.doi.org/10.2116/bunsekikagaku.35.10_839.

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30

Hsieh, Andrew G., Christian Punckt, Sibel Korkut, and Ilhan A. Aksay. "Adsorption of Sodium Dodecyl Sulfate on Functionalized Graphene Measured by Conductometric Titration." Journal of Physical Chemistry B 117, no. 26 (June 24, 2013): 7950–58. http://dx.doi.org/10.1021/jp403876t.

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31

Issa, Yousry M., and Alaa S. Amin. "Conductometric titration of pindolol and propranolol using ammonium reineckate and potassium tetracyanonickelate." Mikrochimica Acta 118, no. 1-2 (March 1995): 85–91. http://dx.doi.org/10.1007/bf01242231.

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32

Raymond, Louise, Frederick G. Morin, and Robert H. Marchessault. "Degree of deacetylation of chitosan using conductometric titration and solid-state NMR." Carbohydrate Research 246, no. 1 (August 1993): 331–36. http://dx.doi.org/10.1016/0008-6215(93)84044-7.

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33

Budovskaya, K. é., I. N. Gorbacheva, G. A. Vikhoreva, and L. S. Gal'braikh. "Conductometric titration of chitosan sulfate polyanions in the presence of extraneous electrolytes." Fibre Chemistry 29, no. 2 (March 1997): 106–9. http://dx.doi.org/10.1007/bf02430701.

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34

Patel, Hasmukh S., and Manhar J. Lad. "Novel Terpolymers: Poly(keto–amine–urea)S." High Performance Polymers 8, no. 2 (June 1996): 225–31. http://dx.doi.org/10.1088/0954-0083/8/2/004.

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Thermally stable polymers containing keto–amine–urea groups have been prepared by condensation of keto–amino groups containing diamine and various diisocyanates. The resulting polymer samples have been characterized by elemental analysis and IR spectra, and Mn estimated by non-aqueous conductometric titration and thermogravimetry. Curing of commercial epoxy resin-DGEBA by employing these polymers was scanned on a differential scanning colorimeter (DSC). Glass fibre reinforced composites (i.e. laminates) based on such terpolymer–epoxy resin system have also been prepared and characterized.

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35

Patel, Jayesh R., Dipan H. Sutaria, and Magan N. Patel. "Physicochemical study of complexation and ion-exchange properties of 2-hydroxy-4-ethoxypropiophenone—ethylene glycol polymer." High Performance Polymers 6, no. 2 (April 1994): 123–32. http://dx.doi.org/10.1177/095400839400600203.

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Copolymers (HEPP-EG) were synthesized by the condensation of 2-hydroxy-4-ethoxypropiophenone with ethylene glycol in presence of polyphosphoric acid as a catalyst. The copolymers were characterized by elemental analyses, IR spectra, viscosity and thermal studies. The number-average molecular weight (Mn) was measured by non-aqueous conductometric titration. The copolymer HEPP-EG-6 was complexed with metal ions, Cu2+, Ni2+, Co2, Mn2+ and Zn2+ and characterized. Chelation ion-exchange properties have been studied by employing the batch equilibration method.

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36

El-Khouly, A. A., E. A. Gomaa, and S. E. Salem. "CONDUCTOMETRIC STUDY OF COMPLEX FORMATION BETWEEN 2,3-PYRAZINEDICARBOXYLIC ACID AND SOME TRANSITION METAL IONS IN METHANOL." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 20, no. 20 (December 20, 2012): 43–50. http://dx.doi.org/10.48141/sbjchem.v20.n20.2012.46_revista_2012a.pdf.

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The complexation reactions between CuCl2 CoCL2 and NiCL2 with 2,3-Pyrazinedicarboxylic acid in methanol (MeOH) at 313.15 K were studied by conductometric methods. The association constants, formation constants and Gibbs free energies were calculated from the conduclometric titration curves. On drawing the relation between molar conductance and the ratio of metal to ligand coflCentrations, different lines were obtained indicating the formation of 1: 1 and 2: 1 (M:L) stoichiometric complexes. The formation constants and Gibbs free energies of different complexes in absolute Methanol at 313.15 Kfollow the order:

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37

Farris, Stefano, Luigi Mora, Giorgio Capretti, and Luciano Piergiovanni. "Charge Density Quantification of Polyelectrolyte Polysaccharides by Conductometric Titration: An Analytical Chemistry Experiment." Journal of Chemical Education 89, no. 1 (October 18, 2011): 121–24. http://dx.doi.org/10.1021/ed200261w.

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38

Rakhmanova, V. N., L. A. Nud’ga, R. Yu Milusheva, B. Z. Volchek, A. A. Kholmuminov, Yu G. Baklagina, and S. Sh Rashidova. "Determination of the degree of sulfation of Bombyx mori chitosan by conductometric titration." Russian Journal of Applied Chemistry 82, no. 12 (December 2009): 2192–96. http://dx.doi.org/10.1134/s1070427209120192.

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39

Liu, Xiu-Ming, Dong-Qin He, and Kuan-Jun Fang. "Adsorption of cationic copolymer nanoparticles onto bamboo fiber surfaces measured by conductometric titration." Chinese Chemical Letters 26, no. 9 (September 2015): 1174–78. http://dx.doi.org/10.1016/j.cclet.2015.05.006.

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40

Beck, Stephanie, Myriam Méthot, and Jean Bouchard. "General procedure for determining cellulose nanocrystal sulfate half-ester content by conductometric titration." Cellulose 22, no. 1 (November 28, 2014): 101–16. http://dx.doi.org/10.1007/s10570-014-0513-y.

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41

Radushev, A. V., L. G. Chekanova, V. Yu Gusev, and E. A. Sazonova. "Determination of hydrazides and 1,2-diacylhydrazines of aliphatic carboxylic acids by conductometric titration." Journal of Analytical Chemistry 55, no. 5 (May 2000): 445–48. http://dx.doi.org/10.1007/bf02757481.

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42

Hassan, Wafaa S., and Mervat M. Hosny. "Spectrophotometric and Conductometric Determination of Clomiphene Citrate and Nefazodone HCl." E-Journal of Chemistry 5, s2 (2008): 1069–80. http://dx.doi.org/10.1155/2008/912365.

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Two accurate, rapid and simple spectrophotometric and conductometric methods were developed for the determination of clomiphene citrate (CMP) and nefazodone HCl (NFZ), the proposed methods depends upon the reaction of ammonium reineckate with the two studied drugs to form stable precipitate of ion-pair complexes, which was dissolved in suitable solvent. The pink colored complexes were determined colorimetrically at 509, 523.6 nm, respectively. Using the conductometric titration, the studied drugs could be evaluated in 50% (v/v) acetone in the range 60.02-540.18 and 63.3-443.1 μg mL-1for clomiphene citrate and nefazodone HCl, respectively. While for spectrophotometric method the ranges were 0.2-1.8 and 0.2-1.6 mg mL-1for clomiphene citrate and nefazodone HCl respectively. Various experimental conditions were studied. The results obtained showed good recoveries with relative standard deviations of 0.759 and 0.552%. The proposed procedures were applied successfully to the analysis of these drugs in their pharmaceutical preparations and the results were favourably comparable with the official and reference methods. The molar combining ratio reveal that (1:1) (drug : reagent) ion associates were formed.

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Oliveira Rossini, Pamela, Fabiana Felix, and Lúcio Angnes. "A simple and precise conductometric method for the determination of losartan in pharmaceutical products." Open Chemistry 10, no. 6 (December 1, 2012): 1842–49. http://dx.doi.org/10.2478/s11532-012-0110-6.

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AbstractLosartan is an antihypertensive agent that lost its patent protection in 2010, and, consequently, it has been available in generic form. The latter motivated the search for a rapid and precise alternative method. Here, a simple conductometric titration in aqueous medium is described for the losartan analysis in pharmaceutical formulations. The first step of the titration occurs with the protonation of losartan producing a white precipitate and resulting in a slow increase in conductivity. When the protonation stage is complete, a sharp increase in conductivity occurs which was determined to be due to the presence of excess of acid. The titrimetric method was applied to the determination of losartan in pharmaceutical products and the results are comparable with values obtained using a chromatographic method recommended by the United States Pharmacopoeia. The relative standard deviation for successive measurements of a 125 mg L−1 (2.71×10−4 mol L−1) losartan solution was approximately 2%. Recovery study in tablet samples ranged between 99 and 102.4%. The procedure is fast, simple, and represents an attractive alternative for losartan quantification in routine analysis. In addition, it avoids organic solvents, minimizes the risk of exposure to the operator, and the waste treatment is easier compared to classical chromatographic methods.

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Saltykova, M. S., Y. B. Elchishcheva, L. G. Chekanova, I. G. Mokrushin, and P. T. Pavlov. "Complex-forming properties of diacylhydrazines of non-pentane acid with Cu(II) and Ni(II) ions in ammonia media." Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 10, no. 2 (2020): 159–68. http://dx.doi.org/10.17072/2223-1838-2020-2-159-168.

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The complexation processes of Cu (II), Co (II) and Ni (II) ions in ammonia solutions with diacylhydrazines of non-pentane acid (DAH): 1,2-dineopentanoyl- (DNH) and 1-neopentanoyl-2-benzoylhydrazine (NBH) were studied. Using saturation, equilibrium shift, curve intersection, and conductometric titration, the formation of complex compounds with the ratios [M (II)]:[DAH] = 1:1 and 1:2 was established. The DNH complex with Cu (II) (1:1) was preparatively isolated, the composition of which was confirmed by the data of IR spectroscopy, elemental and thermal analyzes. The SP precipitate of the complex and the complexation reaction constant are calculated

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FUJINO, Takayoshi, Fumiko YOSHIKAWA, and Hayao NOGUCHI. "Simultaneous differential determination of mixed inorganic acid by nonaqueous conductometric titration with sodium borohydride." Bunseki kagaku 46, no. 3 (1997): 187–93. http://dx.doi.org/10.2116/bunsekikagaku.46.187.

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Coelho, Lúcia H. G., and Ivano G. R. Gutz. "Trace analysis of acids and bases by conductometric titration with multiparametric non-linear regression." Talanta 69, no. 1 (March 15, 2006): 204–9. http://dx.doi.org/10.1016/j.talanta.2005.09.025.

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Fossey, Marcelo Andres, Cecilia Cristina Marques dos Santos, Jorge Chahine, and João Ruggiero Neto. "Coil to Extended Coil Transition in Polygalacturonic Acid: Conductometric Titration and Monte Carlo Simulations." Journal of Physical Chemistry B 104, no. 51 (December 2000): 12174–78. http://dx.doi.org/10.1021/jp001995a.

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Gong, Yong-Kuan, Kenichi Nakashima, and Renliang Xu. "Characterization of Polystyrene Latex Surfaces by Conductometric Titration, Rhodamine 6G Adsorption, and Electrophoresis Measurements." Langmuir 16, no. 22 (October 2000): 8546–48. http://dx.doi.org/10.1021/la000638o.

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Ye, Tao, Bijia Wang, Jian Liu, Jiangang Chen, and Yiqi Yang. "Quantitative analysis of citric acid/sodium hypophosphite modified cotton by HPLC and conductometric titration." Carbohydrate Polymers 121 (May 2015): 92–98. http://dx.doi.org/10.1016/j.carbpol.2014.12.028.

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Afzal, Mehedi, Md Zakir Sultan, Rehana Begum, Asma Rahman, Md Shah Amran, and Md Amjad Hossain. "In vitro Interaction of Nandrolone with Calcium Nitrate, Magnesium Sulfate and Potassium Permanganate in Aqueous Medium." Dhaka University Journal of Pharmaceutical Sciences 11, no. 2 (April 14, 2013): 93–99. http://dx.doi.org/10.3329/dujps.v11i2.14554.

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Nandrolone is an anabolic steroid drug that increases production and urinary excretion of erythropoietin. The drug is indicated with calcium nitrate, magnesium sulfate and potassium permanganate as concomitant uses. Therefore, there is a chance of interactions during concomitant use. Hence, we evaluated the interactions monitored by UV, conductometric titration and Ardon's spectrophotometric methods of nandrolone with calcium nitrate, magnesium sulfate and potassium permanganate at the ratio of 1: 1 at different pHs. It was found that nandrolone did not form any stable complexes at the ratio of 1:1 with the above mentioned salts. DOI: http://dx.doi.org/10.3329/dujps.v11i2.14554 Dhaka Univ. J. Pharm. Sci. 11(2): 93-99, 2012 (December)

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