Direct Spectrophotometric Determination of Phosphonate and Diphosphate Ions Based on the Formation of Heteropoly Blue Complexes

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 spe...

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Bibliographic Details
Published in:Analytical Sciences 1997/06/10, Vol.13(3), pp.369-372
Main Authors: HIMENO, Sadayuki, UEDA, Tadaharu, NIIYA, Hirotaka, IWAI, Itsuko, HORI, Toshitaka
Format: Article
Language:English
Subjects:
absorption spectroscopy
Analytical chemistry
Chemistry
diphosphate ion
Exact sciences and technology
Heteropoly blue complex
phosphonate ion
Spectrometric and optical methods
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Summary: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 1×10-5-1×10-3M and 2×10-5-2×10-4M, respectively. Interferences from foreign ions are also discussed.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.13.369