采用气相色谱-质谱法测定动物源食品中10种有机磷农药的残留量.样品用水及丙酮均质提取,二氯甲烷进行分配后,依次用凝胶色谱和石墨化炭黑固相萃取柱净化.采用气相色谱分离后,质谱法进行测定,外标法定量.10种有机磷农药的质量浓度均在0.01~0.10 mg·L-1范围内与峰面积呈线性关系,测定下限(10S/N)在0.01~0.10 mg·kg-1之间.在3个标准加入水平下进行了回收试验,所得回收率在84.2%~98.7%之间,相对标准偏差(n=10)在5.13%~10.55%之间.

GC in hyphenation with mass spectrometry (GC-MS) was applied to the determination of residual amounts of 10 organophosphorus pesticides in foodstuffs of animal origin.The sample was extracted with H2O and acetone and partitioned with CH2Cl2,which was concentrated and purified by GPC and active carbon SPE column. The eluate was taken for separation by GC and the contents of 10 organophosphorus pesticides were determined by MS.External standard method was adopted in the determination.Linear relationships between values of peak area and mass concentration of 10 organophosphorus pesticides were obtained in the range of 0.01-0.10 mg·L-1,with their lower limits of determination (10S/N) in the range of 0.01-0.10 mg·kg-1.Tests for recovery were made by addition of standard at 3 different concentration levels,values of recovery found were in the range of 84.2%-98.7%,with values of RSD′s (n=10) in the range from 5.13% to 10.55%.