LC-HG-QCAAS VERSUS LC-HG-ICP/OES IN ARSENIC SPECIATION

The coupled technique LC-HG-QCAAS has been used to perform the speciation of arsenite, arsenate, monomethylarsonate and dimethylarsinate in aqueous samples. An optimization of the operating conditions, especially those for atomization, is described. The analytical signals have been collected and processed using a microcomputer. Results of limits of detection, precision, recovery and linear ranges when using peak area and peak height are reported. The technique can be considered cheap enough to be applied to metal speciation analysis in most laboratories.