Residue and dissipation dynamics of saflufenacil in sorghum
[Aims]A QuEChERS method combined with HPLC-MS/MS was developed for the determination of saflufenacil residues in sorghum.[Methods]Sorghum plants and grains were extracted with acetonitrile and water,and soil was extracted with acetonitrile and 0.2％formic acid water.The extracts were purified by PSA,C18,GCB and anhydrous MgSO4,determined by HPLC-MS/MS,and quantified by external standard method.[Results]In the range of 0.001-0.5 mg/L,the mass concentration of saflufenacil had a good linear relationship with its response value.At the spiked levels of 0.01,0.1 and 0.5 mg/kg,the average recoveries of saflufenacil in sorghum plant,soil and grain ranged from 85.6％-101.7％with relative standard deviations(RSDs)of 1.48％-6.28％,and the limit of quantitation(LOQ)was 0.01 mg/kg.The results showed that the dissipation dynamics of saflufenacil in the soil of Inner Mongolia and Jilin were in accordance with the first-order reaction kinetic equation and the half-lives were 3.5 and 3.7 d,respectively.The final residues of saflufenacil in sorghum plant,soil and grain matrix were lower than the limit of quantitation.[Conclusions]It is safe to apply saflufenacil 70％water dispersible granules at the recommended dose during the harvest period.This study can provide a reference for the safe use of saflufenacil and the formulation of maximum residue limit(MRL).
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万方数据
维普
