利用QuEChERS-液相色谱串联质谱法测定氟啶胺和烯酰吗啉在马铃薯、马铃薯植株和土壤中的消解和残留

作者：Li Chen¹,Chunhong Jia¹, Fugen Li²,Junjie Jing¹,Pingzhong Yu¹, Min He¹,Ercheng Zhao¹

发表刊物：Environmental Science and Pollution Research

链接地址：https://doi.org/10.1007/s11356-018-3281-7

Fluazinamanddimethomorph35%suspensionconcentrate(SC)isanewcombinedfungicideformulationintroducedinChinato improvefungicidalefficacyanddecreasetheriskofresistanceinpotatoes.Fluazinamanddimethomorphdissipationandresidues in potatoes, potato plants, and soil under field conditions were determined by ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS). Fluazinam and dimethomorph 35% SC was applied at two doses to potatoes and soil in Ningxia Autonomous Region and Anhui Province, China. Fluazinam and dimethomorph dissipation fitted first-order kinetics, andthefluazinamhalf-livesinpotatoplantsandsoilwere3.3–5.4and9.4–9.5days,respectively.Thedimethomorphhalf-livesin potato plants and soil were 2.1–2.6 and 5.9–8.6 days, respectively. Fluazinam and dimethomorph 35% SC was sprayed onto potato plants three or four times at application rates of 420 and 630 g a.i. ha−1 with 7 days between applications. Potato and soil sampleswerecollectedat3,7,and14daysafterthelastapplication.Potatoesandsoilhadfluazinamconcentrationsof<0.01and <0.05–0.183 mg kg⁻¹, respectively, and dimethomorph concentrations of <0.01 and 0.129–0.677 mg kg⁻¹, respectively. The final fluazinam and dimethomorph concentrations in potatoes were below the EU maximum residue limits (0.02 and 0.05 mg kg−1, respectively) 3 days after application. Fluazinam and dimethomorph can therefore be applied to potatoes at the recommended doses.