A simple spectrophotometric method is proposed for the direct determination of PH032-and P2074_ ions. In acidic solutions containing 50%(v/v) CH3COCH3, the Mo(VI)-Mo(V) reagent reacts directly with PH032-and p2074-ions to form the respective heteropoly blues. The amounts of mixed-valence blue species thus formed depended linearly on the PH032-and P2074_ concentrations in the ranges 1X105 --1X103 .M and 2X105 -2X104 M, respectively. Interferences from foreign ions are also discussed.
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