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A speciation procedure for arsenobetaine (AsB), arsenite (AsIII), dimethylarsinic acid (DMA), mono-methylarsonic acid (MMA) and arsenate (Asv) based on the couplings HPLC-HG-AFS and HPLC-UV-HG-AFS has been developed and results compared with HPLC-HG-AAS and HPLC-UV-HG-AAS. AFS detection improves the performance of these couplings, being the detection limits about twenty times lower (from 0.06 to 0.14 μg l−1 for AFS against 1.1 to 3.9 μg l−1 for AAS). The linear range extends from 0.25 to 8000 μg l−1 for AFS in contrast to 5 to 500 μg l−1 for AAS. This approach has been applied to the arsenic speciation in biological tissues (certified material TORT-1 and fresh bivalve tissues) in which arsenobetaine was the main species found. Extraction of the species has been carried out using repetitive extractions with methanol and methanol/water (1:1) mixtures being the later more suitable for quantitative recovery.
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Gómez‐Ariza et al. (1999) studied this question.
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