Cathodic Stripping Voltammetric Determination of Selenium(IV) at a Nafion Coated Mercury Film Electrode Modified with 3,3′-Diaminobenzidine

Autor:	I-Wen Sun, Hao Yun Yang
Rok vydání:	2000
Předmět:	Detection limit Working electrode Metal ions in aqueous solution Inorganic chemistry chemistry.chemical_element Analytical Chemistry Mercury (element) chemistry.chemical_compound chemistry Nafion Electrode Electrochemistry Voltammetry Selenium
Zdroj:	Electroanalysis. 12:1476-1480
ISSN:	1521-4109 1040-0397
Popis:	Determination of selenium(IV) was investigated on a 3,3′-diaminobenzidine/Nafion/mercury film modified glassy carbon electrode (DNMFE). The 3,3′-diaminobenzidine/Nafion coating solution was irradiated by a tungsten light bulb to oxidize the 3,3′-diaminobenzidine. This coating solution was then spin-coated onto a glassy carbon electrode. Subsequently, mercury was electrodeposited onto the electrode surface. Selenium(IV) was preconcentrated onto the DNMFE from the sample solution saturated with ethylenediaminetetraacetate (EDTA) at an accumulation potential of –0.35 V, and determined by cathodic square-wave stripping voltammetry (SWSV). Various parameters affecting the selenium determination were examined. With 5 min accumulation, the analytical signal was linear from 1 to 300 µgL–1, and the detection limit was 0.48 µgL–1. The proposed procedure showed a good accumulation efficiency for selenium and good resistance to interferences from metal ions as well as surface-active compounds.
Databáze:	OpenAIRE
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