Abstract
A simple spectrophotometric method is proposed for the direct determination of PHO32− and P2O74− ions. In acidic solutions containing 50%(v/v) CH3COCH3, the Mo(VI)-Mo(V) reagent reacts directly with PHO32− and P2O74− ions to form the respective heteropoly blues. The amounts of mixed-valence blue species thus formed depended linearly on the PHO32− and P2O74− concentrations in the ranges 1×10−5 - 1×10−3 M and 2×10−5 - 2×10−4 M, respectively. Interferences from foreign ions are also discussed.
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Himeno, S., Ueda, T., Niiya, H. et al. Direct Spectrophotometric Determination of Phosphonate and Diphosphate Ions Based on the Formation of Heteropoly Blue Complexes. ANAL. SCI. 13, 369–372 (1997). https://doi.org/10.2116/analsci.13.369
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DOI: https://doi.org/10.2116/analsci.13.369