Indirect Electrosorptive Detection via Kinetic Facilitation in Ion Chromatography
作者:
Tore Ramstad,
期刊:
Analytical Letters
(Taylor Available online 1988)
卷期:
Volume 21,
issue 2
页码: 331-356
ISSN:0003-2719
年代: 1988
DOI:10.1080/00032718808055756
出版商: Taylor & Francis Group
关键词: Electrochemical detection;tensammetric detection;double-layer capacitance detection
数据来源: Taylor
摘要:
A new technique based on electrosorption is presented for the determination of selected anions in ion chromatography. Unlike conventional methods, which are based on the measurement of nonfaradaic currents, the present method utilizes a kinetic facilitation imparted to the electroreduction of a cationic “adsorbate probe” by specifically adsorbed anions, and hence involves the measurement of faradaic currents. Amminated, transition-metal salts of Co(III) have been found most useful as adsorbate probes for this application. The current enhancement-analyte concentration response curves obtained were determined to be linear over a limited range at mercury, but show curvature at virtually all concentrations at silver. Detection limits for this technique are slightly higher than those realized using more conventional double-layer capacitance methods. A brief discussion of the future prospects for this new approach is given.
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