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Determination of Clethodim and Its Oxidation Metabolites in Crops by Liquid Chromatography with Confirmation by LC/MS by Susumu Ishimitsu; Akiko Kaihara; Kimihiko Yoshii; Yukari Tsumura; Yumiko Nakamura; Yasuhide Tonogai is a Chemistry article available to read on EtoBox.

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## Abstract A method was developed for determination of the herbicide clethodim (C0) and its oxidation metabolites clethodim sulfoxide (C1) and clethodim sulfone (C2) in agricultural products. Upon extraction, both C0 and C1 were oxidized to C2 by m-chloroperoxybenzoic acid, and C2 was determined by liquid chromatography (LC). The C2 peak was confirmed by liquid chromatography/mass spectrometry (LC/MS) with electrospray ionization (ESI). Recoveries of C0 from radish, tomato, onion, sweet potato, kidney bean, carrot, cabbage, and lettuce ranged from 91 to 118% following fortification at 0.05–1.0 ppm. The detection limit of C2 in crops was 0.01 ppm (S/N > 3). The fortified samples of onion, sweet potato, kidney bean, and carrot were confirmed by LC/MS (ESI), and the peak of C2 was detected.

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Author

Susumu Ishimitsu; Akiko Kaihara; Kimihiko Yoshii; Yukari Tsumura; Yumiko Nakamura; Yasuhide Tonogai

Publisher

Association of Official Analytical Chemists; The Journal of AOAC International; AOAC International; Oxford University Press (OUP) (ISSN 1060-3271)

Published

2001

Language

EN

Field

Chemistry (Physical Sciences)