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Abstract
A method for the determination and speciation of As(III), As(V) and total inorganic arsenic in drinking waters by Differential Pulse Polarography (DPP) is described. As(III) is determined directly and total inorganic arsenic is measured after reduction of electroinactive As(V). The latter is evaluated by difference.
The method involves the removal of interfering ions by anion exchange with Amberlite IRA-400 and the reduction of As(V) to As(III) with a boiling solution of NaHSO3. The efficiency of both procedures is evaluated.
The operational and analytical conditions are optimized in order to allow the detection of low arsenic levels.
The detection and quantitation limits (8.16 and 9.88 ng/ml, respectively) and the precision of the decribed procedure are evaluated. They prove the usefulness of the method.