Abstract
We studied the effect of the commercial formulation of two pesticides, hexachlorocyclohexane (HCH) and benomyl, on sulphate reduction to sulphide in two acid sulphate soils under flooded conditions. Hydrogen sulphide, evolved by acidification of metallic sulphides in flooded soils, was precipitated with excess zinc acetate, and zinc remaining in solution after precipitation was determined by atomic-absorption spectrometry for indirect assay of sulphide. Sulphate decreased considerably with incubation in untreated soils and in soils receiving 10 ppm of either HCH or benomyl upon flooding, with the eventual accumulation of sulphide in substantial quantities. But, sulphate reduction to sulphide was retarded significantly with progressive increase in the concentrations of both pesticides to 50 and 100 ppm. The inhibition of sulphate reduction by these pestivides was related to high redox potentials and a decrease in the population of sulphate reducers in pesticide-treated soils.
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