Analytical Sciences

Abstract − Analytical Sciences, 29(9), 919 (2013).

Determination of Isotianil in Brown Rice and Soil Using Supercritical Fluid Extraction and Gas Chromatography/Mass Spectrometry
Tatsuo YOSHIDA,*,** Asami ITOU,* Rise YAMAMOTO,* Toshiaki TOBINO,* Hiroshi MURAKAWA,* and Kei TODA**
*Kumamoto Prefectural Institute of Public Health and Environmental Science, 1240-1 Kurisaki, Uto 869–0425, Japan
**Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860–8555, Japan
Isotianil (3,4-dichloro-2′-cyano-1,2-thiazole-5-carboxanilide) is a new plant-activating pesticide. Usage of the pesticide was approved for rice fields in 2010 and its production increased 400 times (2 × 104 kg) in the next year. In this work, a method for determining isotianil in brown rice and rice field soil was investigated for the first time. Isotianil was extracted by supercritical fluid extraction and measured by gas chromatography/mass spectrometry. Isotianil was successfully analyzed with good recoveries (95.1 – 99.3%) even from soil samples with strong adsorption of pesticides.