Electrolytic reduction of molybdophosphate in aqueous acetonitrile and its application to flow-coulometric determination of orthophosphate.
The formation and electrolytic reduction of molybdophosphate in aqueous solutions of various water-miscible organic solvents have been extensively investigated. Acetonitrile was found to be the most useful of these solvents. Two species of molybdophosphate are formed in aqueous acetonitrile, one of which changes spontaneously into the other, which is quite stable and undergoes a 2-electron electrolytic reduction. On the basis of these facts, a flow-coulometric method for orthophosphate has been developed, applicable to the range 5 x 10(-6)-1 x 10(-3)M. It has been used for determination of orthophosphate in several phosphorus compounds, some of which are acid-labile.
Hori
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Department of Chemistry, College of Liberal Arts and Sciences, Kyoto University, Kyoto 606, Japan.
Fujinaga
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