岩矿测试Issue(3)：406-412,7.
气相色谱法测定地下水中拟除虫菊酯有机氯百菌清等24种农药残留
Determination of 24 Pesticides including Pyrethroids,Organochlorines and Chlorothalonil in Underground Water by Gas Chromatography
摘要
Abstract
High sensitivity is required to determine pyrethroids,organochlorines,chlorothalonil and chlorpyrifos by using Gas Chromatography-Micro-Electron Capture Detector( GC-μECD)due to their high electro-negativity. The sensitivity of pyrethroids,which have higher molecular weights,is much lower than organochlorines. Moreover,the efficiency of determination is very low by different analyses patterns. This problem has been solved by using a column pressure program,and 24 compounds were determined efficiently at the same time by optimizing column conditions and inlet temperature. The underground water sample was treated by liquid-liquid extraction,Florisil SPE cleanup and analyzed by RTX-CL Pesticides 2 with GC-μECD. The calibration curves for 24 compounds were linear in the range of 0. 5-6000 ng/mL,and the method detection limits were in the range of 1. 00-12. 00 ng/L. The matrix spiked experiments were studied at three different concentration levels. The mean recoveries for low,middle and high concentration were in the range of 80. 3% -116%,79. 9% -117% and 85. 7% -102% with precisions of 1. 5% -6. 8%,1. 3% -7. 6% and 1. 1% -6. 8%,respectively. Compared to common chromatographic column(DB-5MS), the special chromatographic column( RTX-CLPesticides 2 ) is more efficient for analyzing multiple targets and category compounds. The low sensitivity and peak tailing problem of pyrethroids caused by long residence time in column was solved by using a column pressure program. The method is sensitive,accurate,and economical and maintains a high flux,which is easy to determine multiple pesticide residues simultaneously.关键词
地下水/拟除虫菊酯/有机氯农药/百菌清/毒死蜱/气相色谱法/液液萃取Key words
underground water/pyrethroids/organochlorine pesticides/chlorothalonil/chlorpyrifos/Gas Chromatography/liquid-liquid extraction分类
天文与地球科学引用本文复制引用
郭晓辰,饶竹,高冉..气相色谱法测定地下水中拟除虫菊酯有机氯百菌清等24种农药残留[J].岩矿测试,2014,(3):406-412,7.基金项目
中国地质大调查项目 （）
