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In this research, the dissipation dynamics and residue distribution of flurochloridone in potato were assessed using a modified QuEChERS method combined with LC-MS/MS. At 0.01–1 mg kg −1  flurochloridone application, the recoveries ranged from 81.3% to 90.9% in potato leaf, root, tuber and soil, with the relative standard deviation of 1.6%-3.5%. The limits of quantification and detection for flurochloridone were 0.01 and 0.001 mg kg −1  in the four matrices. The dissipation dynamic and terminal residue analyses of flurochloridone 25% emulsifiable concentrate in potato was conducted in three different areas of Qinghai plateau (Haidong, Haixi and Haibei). The half-lives of flurochloridone in the three districts were 25.7, 27.7 and 19.3 days in soil as well as 8.1, 10.2 and 7.0 days in leaf, respectively. The terminal residues of flurochloridone were &lt;0.001, 0.005–0.013, &lt;0.001 and 0.007–0.023 mg kg −1  in potato leaf, root, tuber and soil, respectively, which did not exceed the European maximum residue limit recommendation (0.1 mg kg −1 ). Our findings can provide a basic framework for the appropriate use of flurochloridone in potato in the Qinghai plateau.

Study on residue and dissipation of flurochloridone by LC-MS/MS in potato and soil under open-field conditions in the China’s Qinghai Plateau