Highly Sensitive Voltammetric Speciation and Determination of Inorganic Arsenic in Water and Alloy Samples Using Ammonium 2‐Amino‐1‐Cyclopentene‐1‐Dithiocarboxylate |
| |
Authors: | Ali?Asghar Ensafi Adam?C Ring Ingrid Fritsch |
| |
Institution: | 1. Department of Chemistry, Isfahan University of Technology, Isfahan 84156‐83111, Iran;2. Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, USA |
| |
Abstract: | A simple, fast, reproducible (2.5% RSD at 3.0 μg/L), and sensitive method is described for quantifying As(III) (0.3 μg/L detection limit, 0.5–440 μg/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 μM 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. |
| |
Keywords: | Inorganic arsenic Mercury film electrode Water and alloy samples 2‐Amino‐1‐cyclopentene‐1‐dithiocarboxylate Stripping voltammetry Arsenic |
|
|