An indirect spectrophotometric method for the microdetermination of sulphate has been developed. The sulphate samples were reduced with sodium hypophosphite hydroiodic acid mixture and the hydrogen sulphide thus produced is absorbed in copper copper (II) sulphate solution. Unreacted copper (II), is then reduced to (I) with hydroxylamine sulphate and complexed with neocuproine which is extracted in isoamyl alcohol. The absorbance of the complex is determined at 456 nm and the sulphate ions are determined by difference method.
J ANWAR ,A HUSSAIN ,M I FAROOQI ,S A NAGRA ,
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