Abstract
The recent modification of the Schiff reaction by Dasgupta et al. to determine S(IV) in aqueous solution is an improvement over the generally used West-Gaeke technique. The improvements by Dasgupta et al. include the removal of the mercuric chloride fixing solution, improvement in sensitivity, and unambiguous analysis of S(IV) bound as the formaldehyde adduct, hydroxymethanesulfonic acid (HMSA). The latter is important since Kok et al. have found that the HMSA is resistant to hydrogen peroxide oxidation. In measurement of Southern California cloud water, micromolar concentrations of S(IV) and hydrogen peroxide (H/sub 2/O/sub 2/) have been found to coexist. The original studies by Dasgupta et al. oriented the analytical technique to the analysis of SO/sub 2/ in the gas phase. In this paper the technique is adapted for automated analysis using the Technicon segmented flow system. The reagent concentrations are optimized for the analysis of S(IV) in cloud and precipitation samples. 7 references, 2 figures.
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