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A HYDRIDE GENERATION ATOMIC ABSORPTION TECHNIQUE FOR ARSENIC SPECIATION

Based on an investigation of hydride generation responses in solutions of various acidities containing nanogram quantities of arsenite [As(III)], arsenate [As(V)], monomethylarsonic acid (MMAA) and dimethylarsinic acid (DMAA) a sensitive analytical method for the accurate determination of inorganic and organic As species in aqueous solutions was developed. After a pH-selective reduction, the arsenic species were condensed in a U-tube filled with a gas chromatographic packing immersed in liquid N 2 . The species were then separated by slow warming of the trap and measured with an atomic absorption spectrophotometer