Analytical Sciences

Abstract − Analytical Sciences, 25(2), 207 (2009).

Solid-Phase Extraction Followed by HPLC for the Determination of Phosphorus(V) and Arsenic(V)
Hiroaki MATSUMIYA, Takaaki KIKAI, and Masataka HIRAIDE
Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
Traces of P(V) and As(V) in sample solutions were converted into heteropoly molybdic acids at pH 1.5 and collected onto polyoxyethylene(20)-4-isononylphenoxy ether-coated Amberlite XAD-4 particles. The desorption was carried out with 0.3 M tetramethylammonium hydroxide solution for the HPLC analysis. Molybdophosphoric and molybdoarsenic acids were separated from excess molybdate by ion-pair reversed phase HPLC, though the peaks of P(V) and As(V) could not be resolved. However, the selective decomposition of molybdoarsenic acid with citric acid allowed the differential determination of P(V) and As(V) at the ng mL-1 level. The proposed method was applied to the analysis of high-purity iron for P and As.