Determination of arsenic in soil extracts by flow-through anodic stripping coulometry

Flow-through coulometry was used for the determination of arsenic in soil extracts in 2 mol.dm-3 HCl solution. Arsenic(III) species were deposited on gold plated porous working electrodes and then galvano-statically stripped. The procedure was optimized and possible interferences were identified. The total As content was determined after a reduction step in a microwave oven with hydrazine hydrochloride. The de-tection limit was found to be 0.15 μg·dm-3 in the analyzed solution. A linear response range was achieved up to As concentrations of several mg·dm-3. The procedure was applied for the analysis of soil extract samples from three localities in Slovakia