【摘要】 建立了气相色谱-质谱-选择离子监测(GC-MS-SIM)同时测定土壤中10种农药(三嗪类除草剂、酰胺类除草剂和有机氯农药)的多残留分析方法.样品采用正己烷/丙酮(1:1,V/V)超声提取、氟罗里硅土柱层析净化、GC-MS-SIM测定.10种农药在0.01(0.02)—1.0(2.0)mg.l-1范围内线性良好,相关系数介于0.9963—0.9998之间;在10,50和250ng.g-1添加水平下,平均回收率介于81%—117%之间,相对标准偏差均小于14.4%;方法检出限达到ppb至sub-ppb级(0.1—1.3ng.g-1).将此方法应用于辽宁省不同性质土壤中70个实际土壤样品的分析,阿特拉津、乙草胺、六氯苯、丁草胺、狄氏剂和艾氏剂有检出,该法对不同性质土壤具有广泛适用性.更多还原

【Abstract】 A gas chromatography-mass spectrometry-selected ion monitoring(GC-MS-SIM) method has been deve-loped for multi-residue analysis of 10 pesticides(triazine herbicides,chloroacetanilide herbicides and organochlorine pesticides) in soil.The method is based on ultrasonic extraction using hexane/acetone(1:1,V/V),florisil cleanup and GC-MS-SIM determination.The linear ranges of the 10 pesticides were 0.01(0.02)—1.0(2.0) mg·l-1,and the correlation coefficients were 0.9963—0.9998.The average recoveries of the 10 pesticides at the three spiked levels(10,50,250 ng·g-1) ranged from 81% to 117% with good precision(<14.4%).Pesticides residues could be detected in the low-to sub-ppb range(0.1—1.3 ng·g-1).This methodology has been applied to analysis of 70 real soil samples of different characteristics from Liaoning Province in which atrazine,acetochlor,hexachlorobenzene,butachlor,dieldrin and aldrin were detected.It is widely applicable for soil of different properties.更多还原