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Ethametsulfuron-methyl (ESM) was extensively applied for weed control in rape seed, which taking turns with rice. Such farming model was predominant in southern of China and Southeast Asia. However, ESM damages subsequent rotation with rice, and potentially pollutes the environment. Residue of ESM dynamics in paddy soil is still ambiguous. In this study, a modified high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method for the detection of traces of ESM residues indoi:10.5539/jas.v6n10p119 fatcat:os6qntlahzdmzkaigabzbxynxm