‘琯溪蜜柚’中乙螨唑、啶虫脒的残留测定及套袋对残留的影响

Determination of Etoxazole and Acetamiprid Residue in Citrus maxima‘Guanxi miyou’and Effect of Bagging on Residues

为评价乙螨唑、啶虫脒在‘琯溪蜜柚’上使用的安全性以及套袋对残留量的影响,对其残留消解动态进行研究。在蜜柚上施药进行田间试验,2种施药剂量分套袋和无套袋处理,QuEChERS结合高效液相色谱-串联质谱进行残留检测。结果表明,乙螨唑和啶虫脒在蜜柚中的残留消解动态均符合一级动力学方程,乙螨唑套袋处理的半衰期(T1/2)为5.30~5.47天,无套袋处理的T1/2为4.34~4.54天;啶虫脒套袋处理的T1/2为3.42~3.80天,无套袋处理的T1/2为3.04~3.70天。乙螨唑套袋处理的半衰期略长于无套袋处理的半衰期,而套袋对啶虫脒的半衰期影响不大。施药后65天在蜜柚中没有检出乙螨唑和啶虫脒残留。

To evaluate the safety of etoxazole and acetamiprid in Citrus maxima‘Guanxi miyou’and the effect of bagging on residues,a study on the residual degradation dynamics of etoxazole and acetamiprid was carried out.A field experiment was conducted on Citrus maxima‘Guanxi miyou’,two dosages were sprayed in bagging and non-bagging treatments,and then the residue was determined by QuEChERS combining with HPLC-MS/MS.The results showed that the residual degradation dynamics of etoxazole and acetamiprid followed the first-order kinetic equation,the half-life(T1/2)of etoxazole was 5.30-5.47 d in the bagging treatment,and 4.34-4.54 d in the non-bagging.T1/2 of acetamiprid was 3.42-3.80 d in the bagging treatment,and 3.04-3.70 d in the non-bagging.T1/2 of etoxazole was a little longer in the bagging treatment,but the T1/2 of acetamiprid had no obvious difference between the bagging and non-bagging treatment.The residues of etoxazole and acetamiprid in Citrus maxima‘Guanxi miyou’were not detected on the 65th day after spraying.