Abstract
A simple method for dissolved sulfide determination in colored complex media was developed using ion exchange chromatography. Its principle is based on the complete oxidation of an unstable compound (sulfide) into its stable form (sulfate) through a strong oxidant: hydrogen peroxide. The difference between sample analyzed before and after this treatment gives the total dissolved sulfide. In order to avoid H2S exhaust, this oxidation has to be performed immediately after sampling, without cell separation. In that way, standard solutions were prepared using raw anaerobic effluents from an industrial plant. It was shown in the calibration curve that no bacterial interaction was present. Finally, sulfide from continuous and discontinuous digestions of these sulfate rich wastewaters were successfully assayed by this technique. A theoretical evaluation based on Henry's law and the sulfide dissociation equilibrium led to a very good agreement with the analytical results.
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