Abstract
A method for the analysis of arsenic species in aqueous sulfide samples is presented. The method uses an ion chromatography system connected with a Hydride-Generation Atomic Fluorescence Spectrometer (IC-HG-AFS). With this method inorganic AsIII and AsV species in water samples can be analyzed, including arsenite (HnAsIIIO3n−3), thioarsenite (HnAsIIIS3n−3), arsenate (HnAsVO4n−3), monothioarsenate (HnAsVSO3n−3), dithioarsenate (HnAsVS2O2n−3), trithioarsenate (HnAsVS3On−3) and tetrathioarsenate (HnAsVS4n−3). The peak identification and retention times were determined based on standard analysis of the various arsenic compounds. The analytical detection limit was ~1–3µgL−1 (LOD), depending on the quality of the baseline. This low detection limit makes this method also applicable to discriminate between waters meeting the drinking water standard of max. 10µgL−1 As, and waters that do not meet this standard. The new method was successfully applied for on-site determination of arsenic species in natural sulfidic waters, in which seven species were unambiguously identified.
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