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A sensitive and rapid method is described for the determination of minimal concentrations of soluble sulphide in water. It is based on the reduction of iron(II1) to iron(I1) by sulphide a t pH 3 in the presence of 1,lO-phenanthroline reagent, forming theorangered complex [(C,2H,N2)3Fe]2+. The method is subject to some interferences, which fortunately are not usually present in water supplies. Interferences of many acidic and basic radicals can be successfully overcome by recovery of hydrogen sulphide by steam distillation from the samples acidified with sulphuric acid. Down to 0-5 pg or a concentration of 33 pg 1-1 of sulphide, if 15 ml of sample are available, can be detected by the method.

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