QuEChERS-PSA-气相色谱法分析联苯菊酯·啶虫脒微乳剂在茶园中的残留特征.pdf

2015,34(10):2032-2038
农业环境科学学报
2015年10月
Journal of Agro-ienvironment Science
QUECHERS-PSA-气相色谱法分析联苯菊酯?啶虫脒微乳
剂在茶园中的残留特征
魏鹏,曹梦超,王全胜,刘雅楠,王蒙岑,朱国念
(浙江大学农药与环境毒理研究所,杭州310029)
摘要:利用 QUECHERS-PSA结合气相色谱电子捕获檢测器(GC-ECD)建立了同时檢测茶叶及上壤中联苯菊酯和啶虫脒的分析
方法,并探明了4.5%联苯菊酯?啶虫脒微乳剂在茶园中的降解动态特征。在优化的GC-FCD条件下,0.01~1mg-kg'范内的联苯
菊酯和啶虫脒仪器响应值与其质量浓度呈良好线性关系(=0.9975-0.9989),仪器最小检出量为2.0x10"g。添加回收率试验表明
在茶叶及上壤空白样品基质中添加0.01~1mg-kg'的联苯菊和啶虫脒,平均回收率为89.2%~108.1%,相对标准偏差为2.2%
113%,方法的定量限为0.01mg·kg2,说明该方法准确度、精密度和灵敏度均较好,可用于同时检测茶园中痕量水平的联苯菊脂和
啶虫脒残留。H间试验结果表明,4.5%联苯菊酯?啶虫脒做乳剂在茶叶及上壤中的消解动态曲线符合一级动力学方程,联菊脂和
啶虫脒在茶叶和土壤中的半衰期分别为5.6~13.1d和7.2-8.7d,说明联苯菊酯与啶虫脒在茶园中的消解速率相近,在环境中均属
于易降解化合物,但其所存在的膳食风险仍需结合茶叶加工因子试验及中国地区膳食结构作进一步全面评估。
关键词:联笨菊酯;啶虫脒;茶园;残留特征; Quechens-PSA;气相色谱
中图分类号:X53文献标志码:A文章编号:1672-2043(2015)10-2032-07doi:10.11654/jaes.2015.10.028
Analysis of Residual Profiles of Bifenthrin and Acetamiprid in Tea Garden by QUECHERS-PSA-GC
WEI Peng, CAO Meng-chao, WANG Quan-sheng, LU Ya-nan, WANG Meng-cen, ZHU Guo-nian
Institute of Pesticide and Environmental Toxicology. Zhejiang University, Hangzhou 310029, China)
Abstract: In this work, a method for determination of bifenthrin and acetamiprid in tea and soil using QUECHERS-PSA and GC-ECD( as
ehromalography-elecinon capture dele or)was developed, and the residual profiles of 4.5% bifenthri-ac amirid microm ionin(M)
in tea garden were then investigated. Under the optimized conditions of GC-ECD a good linearity(r=0.997.0.9989 )for standard so
lutions over the concentration range of 0.01-I mg kg was obtained with the limit of et tion(OD )of 2.0x10. The average recoveries
tea and soils fortified with three levels from 0.01 mg kg to 1 mg.kg bifenthrin and acetamiprid ranged from 89.2 to 108.1%, with rel
live standard deviation of 2.2 lo 1 1.3% and 1. 0(of0.01 mg.kg indicating hal the developed method has considerable acuracy. pre
cision and sensitivity, and is applicable for detecting the trace amounts of these pesticides in tea garden. The field trial showed that dynam
ics of 4.5% bifenthrin-acetamiprid ME in tea and soil fit the first-order kinetic equation, with the half-lives of bifenthrin and acetamiprid
being 5.6-8.7 days and 7. 9-8.6 days in tea and 8.5-13.1 days and 7.2-8.7 days in soil, respectively, suggesting that parathyroid and ni-
Imomelhylene heleroeyelic compounds have similar half-life and both belong Lo readily degradable insecticides. However, the health risks
posed by Ihese pesticides in lea need lo be further evalualed in combinalion wilh various lea-processing factors and lhe dietary pallens in
Keywords: bifenthrin; acetamiprid; tea: dissipation dynamics; QUECHERS-PSA: GC
联苯菊脂( Bifenthrin)属拟除虫菊酯类杀虫剂,可期较长;啶虫脒( Acetamiprid)是一种硝基亚甲基杂
用于鳞翅目幼虫、叶蝉、粉虱、蚜虫等的防治,但残效环类新型杀虫剂,其杀虫谱广,对半翅目害虫等有特
效川联苯菊酯具有触杀、旹毒作用,作用迅速,击倒性
收稿日期:201.5-0)4
基金项目:中央高校基本科研业务费安项资金(517302*172210151)
强,但由于其大范围使用,害虫对其已出现抗药性。
作者简介:魏鹏(1990-)、男,硕上研究生。
啶虫脒则作用于昆虫神经系统突触部位的烟碱乙酰
F-mail: 213 16126(@zju. edu. n
胆碱受体,能干扰昆虫神经系统的刺激传导,引起神
通信作者:干蒙岑E-mail:witz(@zju.edu.cn