摘要
提出了土壤中有机氯农药及多氯联苯的测定方法。土壤样品中22种以污染物存在的农药以丙酮-正己烷(1+1)混合溶剂,用加速溶剂萃取仪进行提取,所得萃取液浓缩至1mL,通过固相萃取柱进行纯化。用正己烷-乙酸乙酯(8+2)混合溶剂将农药从柱上洗脱,洗脱液浓缩至1mL后供气相色谱-质谱法测定,采用选择离子(SIM)模式。在两个浓度水平上加入各农药的标准进行了回收试验,测得回收率在68%~130%之间,测定值的相对标准偏差(n=6)均小于25.5%。测得22种农药的检出限(3s/b)在0.25~0.72ng·g^-1之间。
Twenty two organochlorine pesticides (OCP's), including polyehlorobiphenyls (PCBP's), present in soil as pollutants, were extracted from soil sample with mixed solvent of acetone and n-hexane (1 + 1) by accelerated solvent extraction. The extract was concentrated to 1 mL, which was then purified on the solid phase extraction column and eluted from the column with mixed solvent of n-hexane and ethylacetate (8+2). The eluate was concentrated to 1 mL and used for GC-MS determination, with SIM mode. Recovery was tested by addition of standards of the 22 pesticides at 2 different concentration levels, and the results of recovery were found in the range of 68%-130%. Values of RSD's (n=6) found for all the 22 pesticides were less than 25. 5%. Detection limits (3s/b) found were in the range of 0. 25 to 0. 72 ng·g^-1.
出处
《理化检验(化学分册)》
CAS
CSCD
北大核心
2009年第7期858-861,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
国土资源部地质大调查项目资助(1212010511218)