高比活度[苯环-14C]-环磺酮在好氧土壤中的降解转化研究OA

Tembotrione is a 4-hydroxyphenylpyruvate dioxygenase(HPPD)inhibitor herbicide.Studying the degradation of Tembotrione in aerobic soil is crutial for its environmental safety assessment.This study investigated the main degradation products,degradation pathways,and change pattern of degradation product content with time in aerobic soil by liquid chromatography-high resolution mass spectrometry and other modern analytical methods using high specific activity[phenyl-14C]-Tembotrione as a tracer.Results showed that under aerobic conditions,the degradation of Tembotrione in all the four soil samples followed a first-order kinetic model,and the half-life of Tembotrione in red loam,fluvio-aquic soil,black soil and cinnamon soil was 13.18,5.05,10.49 and 2.82 d,respectively.Three main degradation products(M1,M2 and M3)of Tembotrione were identified in the four aerobic soils,and the degradation pathway in aerobic soil was proposed.,In addition,the content of degradation products in all four soils showed the order of M2(0.5%-60.8%AR)＞M3(0.0-10.0%AR)＞M1(0.0-3.9%AR)during the whole incubation process,except for the 120-day sampling point of fluvio-aquic soil.Overall,this study provides more knowledge for assessing the environmental safety of Tembotrione.