Analytical Sciences

A Rapid and Sensitive Analysis of Diphenylarsinic Acid in Water by Gas Chromatography/Mass Spectrometry

Kyoung Suk KIM,* Ryota SHINOHARA,* Koji ARIZONO,* Yoshinori KANETSUNA,** and Minoru KOGA*

*Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, Japan
**Towakagaku Co.Ltd., 10-2 Hakozaki-cho, Nihonbashi, Chuo-ku, Tokyo 103-0015, Japan

A rapid and sensitive analytical method using pentafluorothiophenol (PFTP) derivatization was applied to detect diphenylarsinic acid (DPAA) in water. In this study, the optimum derivatization conditions, such as acid concentration, reaction time and reaction temperature, were investigated to develop a suitable procedure for DPAA determination. After extracting the derivatives into benzene, the determination was carried out by gas chromatography/mass spectrometry (GC/MS) with selected ion monitoring (SIM). The detection limit of the method was 9.4 µg/l, and the overall recoveries obtained from real environmental samples were 88.9 - 104.7% and coefficient variations were 5.1 - 13.9%.

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