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Simultaneous determination of phosphonate, phosphate, and diphosphate by capillary electrophoresis using in-capillary complexation with Mo(VI)

✍ Scribed by Sadayuki Himeno; Naoko Inazuma; Eri Kitano

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
500 KB
Volume
30
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

This study describes the simultaneous determination of phosphonate, phosphate, and diphosphate by CE with direct UV detection, based on in‐capillary complexation with Mo(VI). When a mixture of phosphonate, phosphate, and diphosphate was injected into a capillary containing 3.0 mM Mo(VI), 0.05 M malonate buffer (pH 3.0) and 45% v/v CH~3~CN, three well‐defined peaks, due to the migration of the corresponding polyoxomolybdate anions, were separated. The respective calibration graphs were linear in the concentration range of 2Γ—10^–6^–2Γ—10^–4^ M for phosphonate, 1Γ—10^–6^–5Γ—10^–5^ M for phosphate, and 1Γ—10^–6^–2Γ—10^–4^ M for diphosphate; the correlation coefficients were better than 0.9990. The present CE method is successfully applied to the simultaneous determination of phosphonate, phosphate, and diphosphate in tap water.

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