Cathodic Stripping Voltammetry of 2-Mercapto-5-Methyl-1,3,4-Thiadiazol and 2,5-Dimercapto-1,3,4-Thiadiazol at a Controlled-Growth Mercury Drop Electrode

Author： Skrzypek S. Kasprzak M. Ciesielski W.

Publisher： MAIK Nauka/Interperiodica

ISSN： 1061-9348

Source： Journal of Analytical Chemistry, Vol.60, Iss.10, 2005-10, pp. : 978-981

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Abstract

2-Mercapto-5-methyl-1,3,4-thiadiazol (MMTD) and 2,5-dimercapto-1,3,4-thiadiazol (DMTD) were studied by differential pulse cathodic stripping voltammetry (DPCSV). The influence of buffer, pH, accumulation potential (E _acc), and accumulation time (t _acc) was investigated. It was stated that the concentration of the buffer affects the height of DPCSV peaks. The best analytical signals were recorded in acetate buffer at pH 4.3 and a buffer concentration of 0.01 mol/L for MMTD and 0.02 mol/L for DMTD, E _acc = 0.2 V, and t _acc = 120 s for MMTD and 180 s for DMTD. A linear dependence was found from 1 to 8 × 10⁻⁸ mol/L for MMTD and from 1 × 10⁻⁸ to 1 × 10⁻⁷ mol/L for DMTD. The influence of cations [Cu(II), Co(II)] was also considered.