关键词: LC-MS/MS, LC-MS/MS

Abstract: In order to evaluate scientifically on the ecological safety of metiram in soil environment, the degradation characteristics of metiram in three typical soils, including black soil from northeast of China, and red soil from Jiangxi Province of China and also rice soil from Jiangsu Province of China, and emerging and dissipating of its ethylene thiourea (ETU) metabolite were both studied comparatively under laboratory conditions in the study. It was indicated that degradation of metiram in soil was accord with first order degradation kinetics, and physicochemical properties and moisture surrounding of tested soil had great effect on the degradation of metiram. Metiram was degraded the fastest in the rice soil of the highest pH and the most organic matter content, and it was degraded most slowly in the red soil of most acidity and least organic matter content from Jiangxi Province of China. Compared with aerobic condition, metiram was degraded faster under anaerobic condition. It was assumed that the biodegradation played a main role in the dissipation of metiram in these soils. The residues of metabolites ETU could be detected in all of the three soils during degradation of metiram. The content change of ETU in black soil from northeast China was accumulating first, and then being decreased little by little. However, it was decomposed too quickly in the other two tested soils to be detected later. ETU could be decreased to 0.05 mg/kg of safety threshold until 90% degradation of the raw pesticide.