Determination of selenium(IV) by catalytic stripping voltammetry with an in situ plated bismuth-film electrode.
A very sensitive and simple method is presented for the determination of Se(IV) by Osteryang square-wave cathodic stripping voltammery (OSWCSV). The method is based on the reduction of Se(IV) with Bi(III) onto an edge-plane type of pyrolytic graphite substrate, followed by a cathodic potential scan. OSWCSV studies indicate that the reduced selenium produced a distinct catalytic hydrogen wave at -1150 mV vs. Ag/AgCl. The peak height of the catalytic hydrogen wave was directly proportional to the initial Se(IV) concentration in the ranges of 0.1 - 1.0 and 1.0 - 20.0 microg L(-1) (correlation coefficients 0.9800 and 0.9901, respectively) when the optimized parameters were used. A 3sigma detection limit of 0.025 microg L(-1)0 Se(IV) was obtained at 30 s deposition time. The relative standard deviation was 4.0% on replicate runs (n = 12) for the determinations of 0.10 microg L(-1) Se(IV). Analytical results of natural water samples demonstrate that the proposed method is applicable to speciation analysis of Se(IV) and Se(VI).
Long
Jiajie
J
Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui, Japan.
Nagaosa
Yukio
Y
D001729:Bismuth / Q000737:chemistry*; D002138:Calibration; D002384:Catalysis; D004566:Electrodes; D006859:Hydrogen; D012643:Selenium / Q000032:analysis* / Q000737:chemistry*; D014867:Water / Q000032:analysis
D014867:Water; D006859:Hydrogen; D012643:Selenium; D001729:Bismuth