Residue Analysis Method and Sample Storage Stability of Three Her-bicides in Maize
A method for the determination of acetochlor,topramezone and fluroxypyr in maize by HPLC MS was established.The samples were extracted with acetonitrile containing 0.3%formic acid,and the mobile phase consisted of acetonitrile-0.1%formic acid+4.5 mmol/L ammonium formate+0.5 mmol/L ammonium fluoride for gradient elution.The results showed that in the range of 0.001-0.5 mg/L,the three herbicides showed good linearity(R≥0.998 3),the average re-covery rate of the three pesticides was 76.7%-102.2%,and the relative standard deviation was 1.2%-10.5%.Under-10℃comditions,acetochlor,topramezone and fluroxypyr could be stored stably in maize residue samples for at least 30 d.Under-20℃conditions,acetochlor,toprame-zone and fluroxypyr could be stored in maize residue samples for at least 210 d.This method pro-vides reference for residual detection and storage stability analysis of acetochlor,topramezone and fluroxypyr.
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