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Direct electrochemical determination of arsenate (As V ) in neutral pH waters is considered impossible due to electro-inactivity of As V . As III on the other hand is readily plated as As 0 on a gold electrode and quantified by anodic stripping voltammetry (ASV). We found that the reduction of As V to As III was mediated by elemental Mn on the electrode...
Determination of the speciation of arsenic in groundwaters, using cathodic stripping voltammetry (CSV), is severely hampered by high levels of iron and manganese. Experiments showed that the interference is eliminated by addition of EDTA, making it possible to determine the arsenic speciation on-site by CSV. This work presents the CSV method to determine As(III) in high-iron or -manganese groundwaters...
Contamination of groundwater with arsenic (As) is a major health risk through contamination of drinking and irrigation water supplies. In geochemically reducing conditions As is mostly present as As(III), its most toxic species. Various methods exist to determine As in water but these are not suitable for monitoring arsenic speciation at its original pH and without preparation. We present a method...
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