演題概要

オーラルセッション

第2日 5月19日(木) 9:20~9:40 B会場(星雲1)

炭素安定同位体比を用いた有機農業用資材に含まれるシペルメトリンの異同識別

(秋田県大システム科技)
o川島洋人刈谷拓郎

Some natural plant extract formulations (NPEFs, also referred to as essential oils) used in organic farming have been shown to contain synthetic pesticides. we used gas chromatography coupled with combustion, cryofocusing, and isotope ratio mass spectrometry to determine the stable carbon isotope ratios (δ13C) for the cypermethrin in the four NPEF samples, as well as in ten cypermethrin reagents and two commercial pesticide formulations (Agrothrin emulsion and Agrothrin water-dispersible powder). The δ13C values (± standard deviation) of the 16 cypermethrin samples ranged from -28.3 ± 0.2‰ to -24.5 ± 0.2‰. Surprisingly, the four NPEFs showed similar δ13C values (-26.8‰ to -27.3‰), suggesting that the cypermethrin in all the samples came from the same source (either the same chemical reaction or the same primary material).