建立了使用分散固相萃取的QuEChERS前处理方法,并通过超高效液相色谱串联质谱（Ultra Performance Liquid Chromatography Tandem Mass Spectrometry,UPLC-MS/MS）对糙米、稻壳和秸秆样品中的噁唑酰草胺和氰氟草酯及其代谢物成功进行了定量测定。结果表明,水稻于2叶1心期施药1次,收获后测定稻谷和糙米中噁唑酰草胺、氰氟草酯及其代谢产物的残留量,均未被检出。通过将国家估算的每日摄入量与可接受的每日摄入量进行比较,评估了这些农药的风险系数（Risk Quotients,RQ）。膳食风险评估的结果显示,在糙米中的噁唑酰草胺和氰氟草酯的RQ分别为0.87%和1.90%,表明在GAP条件下施用噁唑酰草胺和氰氟草酯对消费者的健康风险较低。

A QuEChERS pretreatment method using dispersive solid-phase extraction was established, and the residual amount of metamifop and cyhalofop-methyl and their metabolites in brown rice, rice husk and straw samples were determined by ultra performance liquid chromatography tandem mass spectrometry （UPLC-MS/MS）. The results showed that, none of the residues of metamifop and cyhalofop-methyl in rice grain and brown rice harvested at maturity were detected. The risk quotients （RQ） for these pesticides were assessed by comparing the country's estimated daily intake with the acceptable daily intake. The results of the dietary risk assessment showed that the RQ of metamifop and cyhalofop-methyl in brown rice were 0.87% and 1.9%, respectively. Consumers have lower health risk after consumption.