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Резкое улучшение нижнего предела функционирования ионоселективных электродов путём оптимизированной гальваностатической поляризации

Резкое улучшение нижнего предела функционирования ионоселективных электродов путём оптимизированной гальваностатической поляризации

Abstract

Ca2+ и Cd2+ в сильно разбавленных растворах. Библиогр. 38 назв. Ил. 6. Табл. 1. The detection limits of ionophore-based Caand Cd-selective electrodes were improved down to 10−10M by means of galvanostatic polarization of the polymeric membranes with cathodic current. The potential was registered first at zero current, then at some chosen cathodic current, and after that again at zero current. The current densities were optimized for each particular concentration of the solution according to the algorithm developed for this purpose. The potential values recorded after turning the current off, at the beginning of the relaxation curve, were used as analytical signals. The calibration curves plotted with these values correspond to Nernstian behavior of the ISEs down to very low concentrations. The algorithm for analytical determination of Ca2+ and Cd2+ in diluted solutions was developed and successfully tested

Пределы обнаружения кальцийи кадмий-селективных электродов на основе нейтральных ионофо-ров были снижены с 10 до 10 моль/л при помощи гальваностатической поляризации полимерных мембран катодным током. Потенциал регистрировали сначала при нулевом токе, затем в условиях поляризации, после чего хронопотенциометрическая кривая записывалась в течение некоторого времени при выключенном токе. Плотности токов были оптимизированы для каждой концентрации электролита согласно разработанному алгоритму оптимизации. Аналитическим сигналом служило значение потенциала после выключения тока, в начале релаксационной кривой. Калибровочные зависимости, построенные с использованием этих значений, соответствовали теоретическому нернстовскому отклику электродов вплоть до сильно разбавленных растворов. Разработан и успешно проверен алгоритм аналитического определения

Keywords

ИОНОСЕЛЕКТИВНЫЕ ЭЛЕКТРОДЫ, ПОЛИМЕРНАЯ МЕМБРАНА, НИЖНИЙ ПРЕДЕЛ ОБНАРУЖЕНИЯ, ГАЛЬВАНОСТАТИЧЕСКАЯ ПОЛЯРИЗАЦИЯ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold