The sulphide-ion electrode was used to study tile kinetics and reactions of free hydrogen sulphide in solution of flooded rice soiIs. The observed sulphide potential obeyed the Nernst equation over a range of sulphide-ion concentration from 10 -1 to 10 -19 M.Peak H2S concentrations were lowest in neutral soils high in iron and manganese; moderately high in soils low in iron or high in organic matter; and highest in acid sulphate soil low in iron. Harmful concentrations of H~S may be present in acid sulphate and acid soils low in iron during tile first few weeks after flooding. Tile concentrations in acid sulphate soils can be drastically lowered by liming.There was thermodynamic evidence for the presence of FeS and ZnS in the solutions of most soils.
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