Coulometric–potentiometric titration of bases and acids in γ-butyrolactone

Mihajlović, R.; Stanić, Zorka; Antonijević, Milan M.

doi:10.1016/j.aca.2003.07.006

Cited by 12 publications

(3 citation statements)

References 33 publications

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“…The concentration of the solutions of bases was checked by titration with H + ions generated by the oxidation of hydrogen dissolved in palladium. 26 Tetrabutylammonium hydroxide (laboratory-reagent grade), 0.1 M in 2-propanol-methanol (10:1 v/v), was standardized against benzoic acid with Thymol Blue as the indicator. A Thymol Blue solution was prepared by dissolving 0.1 g of Thymol Blue in 100 mL of methanol.…”

Section: Methodsmentioning

confidence: 99%

Noble Metal Oxides Electrodes and Analytical Application Thereof for Acid-Base Titrations in Non-Aqueous Solvents

Stanić¹,

Dimić²,

Simić³

2012

J. Electrochem. Soc.

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Electrochemical characterization of palladium and platinum oxide electrodes is reported. Palladium (platinum) oxide layer has been formed by thermal oxidation of smooth Pd(Pt) electrode. The palladium/palladium oxide electrode enables fast measurements, with good sensitivity of 54 ± 0.9 mV per decade, in acidic and base solutions (linear range of response up to the concentration 1 × 10 −6 M) in acetonitrile and 49 ± 1.2 mV per decade in propionitrile. The response of the platinum/platinum oxide was linear in the concentration range between 5 × 10 −2 and 1 × 10 −6 M, and a sensitivity of 52 ± 1.6 mV per decade in acetonitrile was obtained. The response time of the electrodes was less than 15 s in the both solvents. The properties of the palladium oxide electrode were similar to those of the platinum one. Some potential analytical applications of the sensors are pointed. Palladium and platinum oxide electrodes for the potentiometric titrations of acids (benzoic, anthranilic, salicylic acids, and sulfadiazine) and bases (N,N -diphenylguanidine, tributylamine, and collidine) in acetonitrile and propionitrile were studied. Potassium hydroxide, tetrabutylammonium hydroxide and perchloric acid proved to be very suitable titrating agents for these titrations. The standard deviation of the determination of the investigated acids and bases was less than 0.7% from those obtained with a glass electrode. The electrodes have the following advantages: fast response, and reproducibility, the service life is long and without considerable divergence in potentials, the manufacture is simple, the production cost is low.

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Section: Methodsmentioning

confidence: 99%

Noble Metal Oxides Electrodes and Analytical Application Thereof for Acid-Base Titrations in Non-Aqueous Solvents

Stanić¹,

Dimić²,

Simić³

2012

J. Electrochem. Soc.

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“…The determination of acid and alkali in non-aqueous solutions, through coulometric titration, has been reported in a previous study. Mihajlović [16] proposed that the alkaline ions (m-cresolate ions) could be electrogenerated to determine acid in a γ-butyrolactone solution, by using m-cresol as the cathodic depolarizing agent, and tetrabutylammonium perchlorate as the supporting electrolyte. Johansson [17] titrated acids by generating OH − in isopropanol or a mixture of isopropanol and methylacetone, which contained a trace of water.…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Amounts of Hydrofluoric Acid in Non-Aqueous Solutions by the Coulometric Titration Method

Huang

Shen

Liu

et al. 2018

Sensors

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For monitoring of trace amounts of hydrofluoric acid in the organic fluorine chemical industry, a facile method for determination of the hydrofluoric acid in an ethanol solution of lithium chloride, by coulometric titration, was proposed. Relying on homemade acid–base coulometric autotitrator, the electrolyte was 0.50 mol·L−1 LiCl ethanol solution and the constant current intensity was 0.2–2 mA. As for the working electrode pair, a platinum plate was used as a working electrode, and a platinum wire was used as an auxiliary electrode. The indicating electrode was the pH composite glass electrode and the titration endpoint was pH 5.50. The results showed that the relative standard deviation was below 2.0%, as the content of the hydrofluoric acid was between 2 μg to 100 μg. The recovery rate was 99.0–102.0%. This proposed route has the advantages of simplicity, convenience, quickness, accuracy, and automation, which can be applied to the accurate determination of trace amounts of hydrofluoric acid, in non-aqueous solutions.

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“…3,6,[41][42][43][44][45] Some dihydroxy and trihydroxy phenols and some esters of gallic acid can be applied for the coulometric generation of acids (hydrogen ions) in some dipolar aprotic solvents, such as acetonitrile, acetic acid-acetic anhydride, nitromethane, sulfolane and g-butyrolactone.…”

Section: Coulometric-potentiometric Determinations Of Bases Using Pyrmentioning

confidence: 99%

Application of Pyrite and Chalcopyrite Electrodes for the Acid-Base Determinations in Nitriles

Simi¹,

Stani²,

Antonijevi³

2011

J. Braz. Chem. Soc.

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Os minerais naturais pirita e chalcopirita tem sido usados como sensores em eletrodos indicadores usando acetronitrila e propionitrila como solventes. Os resultados mostram vantagens excepcionais da pirita e chacopirita como sensores eletroquímicos e também a possibilidade de aplicação desses eletrodos para determinações em solventes não aquosos onde eletrodos de vidro mostram dificuldades. O comportamento dos eletrodos indicadores de pirita e chalcopirita em nitrila foi avaliado pela titulação de diversas bases e ácidos de forças diferentes usando prótons e íons liato gerados pela oxidação de alguns ésteres de ácido gálico e fenóis diidróxi, bem como m-cresol e 3-metóxifenol. Os resultados obtidos com esses eletrodos foram comparados com os de eletrodos de vidro nas mesmas condições, obtendo-se boa concordância, reprodutividade e precisão. Os desvios padrão na determinação dos ácidos e bases investigados foram menores do que 0,9%. Em titulações potenciométricas com pirita e chalcopirita como eletrodos indicadores, o potencial é instantaneamente estabelecido. Ambos os eletrodos podem ser usados sem qualquer limitação temporal ou divergências potenciais consideráveis.The natural minerals pyrite and chalcopyrite have been used as the indicator electrode sensors using acetonitrile and propionitrile as solvents. The results show the exceptional advantage of pyrite and chalcopyrite as electrochemical sensors and also the possibility of the application of these electrodes for the determination in nonaqueous solutions where glass electrode shows many defaults. The behaviour of the pyrite and chalcopyrite indicator electrodes in nitriles were checked by titrating several bases and acids of different strengths using protons and lyate ions generated by the oxidation of some gallic acid esters and dihydroxy phenols, as well as m-cresol and 3-metoxy phenol. The results obtained by using these electrodes were compared with those obtained by the application of a glass electrode under the same conditions, and good agreement, reproducibility and accuracy were obtained. The standard deviation of the determination of the investigated acids and bases was less than 0.9%. In the potentiometric titrations with pyrite and chalcopyrite indicator electrodes, the potential is instantaneously established throughout. Both electrodes can be used without any time limit or without considerable divergence in potentials.

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Coulometric–potentiometric titration of bases and acids in γ-butyrolactone

Cited by 12 publications

References 33 publications

Noble Metal Oxides Electrodes and Analytical Application Thereof for Acid-Base Titrations in Non-Aqueous Solvents

Noble Metal Oxides Electrodes and Analytical Application Thereof for Acid-Base Titrations in Non-Aqueous Solvents

Determination of Trace Amounts of Hydrofluoric Acid in Non-Aqueous Solutions by the Coulometric Titration Method

Application of Pyrite and Chalcopyrite Electrodes for the Acid-Base Determinations in Nitriles

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