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Simultaneous traces of m/z 48 (32S16O+) and m/z 91 (75As16O+) signals in model solution mixtures of arsenite, arsenate, plus dissolved sulfide (see Table 1; AS22 column with isocratic elution). Based on peak area analysis, two thioarsenic species were identified with S/As ratios of 2:1 and 3:1.
