‘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
2021-01-16胡彧娴
胡彧娴
摘要: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。
关键词:乙螨唑;啶虫脒;琯溪蜜柚;残留;套袋
中图分类号:S481.8文献标志码:A论文编号:cjas2020-0162
基金项目:2018年漳州市自然科学基金项目“琯溪蜜柚中多残留QuEChERS HPLC-MS/MS检测方法的建立及套袋控残技术研究”(ZZ2018J30)。
Determination of Etoxazole and Acetamiprid Residue in Citrus maxima‘Guanxi miyou’and Effect of Bagging on Residues
Hu Yuxian
(Zhangzhou Agricultural Test and Inspection Centre,Zhangzhou363000,Fujian,China)
Abstract: 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 65thday after spraying.
Keywords: Etoxazole; Acetamiprid; Citrus maxima‘Guanxi miyou’; Residue; Bagging
0引言
乙螨唑屬于噁唑类杀螨剂[1],广泛用于柑桔、棉花、花卉、蔬菜等作物上的叶螨防治[2],具有杀卵、杀幼虫活性[3]。啶虫脒是一种广谱的速效性杀虫剂,具有触杀、胃毒和较强的渗透作用[4],在国内广泛用于防治蔬菜、水果等作物的蚜虫[5],对柑桔蚜虫防治效果尤其突出[6]。‘琯溪蜜柚’是国内柚类主栽良种之一[7],原产于福建省平和县[8],是当地的主要经济作物。由于‘琯溪蜜柚’产生的经济效益较高,近年来种植规模不断扩大,现在平和已成为国内最大的柚类生产基地县和出口基地县[8]。然而,随着单一化种植及农药、化肥的不合理使用,蜜柚上的虫害发生日趋严重,已影响到蜜柚的品质和产量。……
