Wu Junxue, Wang Kai, Zhang Yun, Zhang Hongyan
College of Science, China Agricultural University, Beijing, 100193, People's Republic of China.
Environ Monit Assess. 2014 Oct;186(10):6959-67. doi: 10.1007/s10661-014-3902-7. Epub 2014 Jul 11.
Cyhalofop-butyl is an aryloxyphenoxypropionate postemergence herbicide with good control of barnyard grass in rice paddies. In this study, method for the determination of cyhalofop-butyl and its metabolite was developed with high-performance liquid chromatography tandem mass spectrometry. Dissipation and residue levels of cyhalofop-butyl and its metabolite in rice ecosystems were also investigated. Recoveries and relative standard deviations of cyhalofop-butyl and cyhalofop acid in six matrices at three spiking levels ranged from 76.1 to 107.5% and 1.1 to 8.2%, respectively. The limit of quantitation (LOQ) of cyhalofop-butyl and cyhalofop acid was 0.01 mg/kg in paddy water, paddy soil, rice plant, rice straw, rice hulls, and husked rice. For field experiments, the results showed that cyhalofop-butyl degraded to cyhalofop acid quickly, and the half-lives of cyhalofop acid in paddy water, paddy soil, and rice plant were 1.01-1.53, 0.88-0.97, and 2.09-2.42 days, respectively. Ultimate residues of cyhalofop-butyl and its metabolite in the rice samples were not detectable or below 0.01 mg/kg at harvest.
氰氟草酯是一种芳氧苯氧丙酸类苗后除草剂，对稻田稗草有良好的防除效果。本研究建立了高效液相色谱串联质谱法测定氰氟草酯及其代谢物的方法。同时，还研究了氰氟草酯及其代谢物在水稻生态系统中的消解和残留水平。氰氟草酯和氰氟草酸在6种基质中3个加标水平下的回收率和相对标准偏差分别为76.1%至107.5%和1.1%至8.2%。氰氟草酯和氰氟草酸在稻田水、稻田土壤、水稻植株、稻草、稻壳和糙米中的定量限均为0.01 mg/kg。田间试验结果表明，氰氟草酯迅速降解为氰氟草酸，氰氟草酸在稻田水、稻田土壤和水稻植株中的半衰期分别为1.01 - 1.53天、0.88 - 0.97天和2.09 - 2.42天。收获时，水稻样品中氰氟草酯及其代谢物的最终残留量未检出或低于0.01 mg/kg。
