Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


потенциометрическое титрование

MODIFIED SEMICONDUCTION ELECTRODES BASED ON GALLIUM ARSENIDE IN POTENTIOMETRIC TITRATION

Ways of electrochemicals modification surface semiconducting electrode based on gallium arsenide (GaAs) was proposed in this work/ Behavior of unmodified and modified GaAs was investigated characterization was identified (steepness of electrode function, working interval? responses time, reproducibility). Possibility of using electrodes from GaAs for potentiometric titration of ions Cu2+ and Pb2+ was set. Modified GaAs-electrodes has improved electroanalitical characterizations in variants direct potentiometric titration was shown.

ИСПОЛЬЗОВАНИЕ ТИТАНОВОГО ЭЛЕКТРОДА ДЛЯ ОПРЕДЕЛЕНИЯ ИОНОВ ВАНАДИЯ (IV) В СУХИХ ОСТАТКАХ НЕФТЕЙ

В работе предложен индикаторный электрод на основе ме-
таллического титана. Исследованы его электроаналитиче-
ские свойства (электродная функция, время отклика, предел
чувствительности, рН-зависимость) в растворах ионов ва-
надия (IV). Показана возможность использования данного
электрода для определения ванадия (IV) в сухих остатках
нефтей.
 

Mass Fraction Evaluation of the Basic Substance in Dialkyl Methylphosphonate Samples by Potentiometric Titration

A technique for the mass fraction evaluation of the basic substance in dialkyl methylphosphonate samples by automatic potentiometric titration is presented. A comparison was made with a certified technique of visual titration. Several advantages of our method are shown: the ability to automate analysis, a reduced sample weight, a constant and precise volume of a titrant drop, a reduced detection time, avoiding the use of chemical indicators, an improved precision of analysis.