Highly Sensitive Voltammetric Speciation and Determination of Inorganic Arsenic in Water and Alloy Samples Using Ammonium 2-Amino-1-Cyclopentene-1-Dithiocarboxylate

by Ensafi, Ali Asghar; Ring, Adam C.; Fritsch, Ingrid

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A simple, fast, reproducible (2.5% RSD at 3.0 mu g/L), and sensitive method is described for quantifying As(III) (0.3 mu g/L detection limit, 0.5-440 mu g/L dynamic range). Anodic stripping voltammetry (ASV) is performed after accumulating arsenic at a mercury film electrode at -0.350 V vs. Ag/AgCl (saturated KCl) for 20 s in 0.2 M HCl containing 8 mu M ammonium 2-amino-1-cyclopentene-1-dithiocarboxylate (AACD), without oxygen removal. This is the first report of using AACD in ASV and in electrochemical quantification of As(III). Total arsenic is determined after sodium-sulfite-reduction of As(V) to As(III). Interferences are minimal. Method validation involved water and metal alloy samples.

Journal
Electroanalysis
Volume
22
Issue
11
Year
2010
Start Page
1175
ISBN/ISSN
1040-0397
DOI
10.1002/elan.200900347