气相色谱-质谱法同时测定土壤中30种农药残留

Simultaneous Determination of 30 Pesticide Residues in Soil by GC-MS

摘要: 采用气相色谱-质谱法同时测定土壤中30种农药残留.样品经过丙酮-正己烷(1+1)混合溶液均质提取,再用正己烷进行萃取,弗罗里硅土柱净化后,采用HP-5MS色谱柱分离,选用电子轰击离子源和选择离子监测模式进行质谱分析,外标法定量.30种农药的线性范围为0.1~1.0 mg·L-1,检出限(3S/N)为3.8~9.6 μg·kg-1.加标回收率在75.8%~103%之间,测定值的相对标准偏差(n=6)在5.6%~9.7%之间.

Abstract: A GC-MS method was developed for the determination of 30 pesticide residues in soil.The sample was extracted with acetonen-hexane (1+1) and hexane in succession.Then the extract was cleaned up on a florisil cartridge and separated on a HP-5MS column.EI-SIM was adopted in MS and external standard was used for quantification.The linearity range of 30 pesticide residues was 0.1-1.0 mg·L-1 with detection limits (3S/N) in the range of 3.8-9.6 μg·kg-1.The recovery rates measured by standard addition method were in the range of 75.8%-103% and RSD (n=6) were in the range of 5.6%-9.7%.