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采用Envi-18固相萃取小柱富集水样,用正己烷/丙酮混合溶剂洗脱水样中42种POPs化合物,再用气质联用法测定。通过优化仪器监测条件,使目标物在0.250 mg/L~5.00 mg/L范围内线性良好。方法检出限为50.9 ng/L~11 640 ng/L,实际水样加标回收率为57.1%~129%,测定结果的RSD为0.1%~13.8%。将该方法用于测定浙江省东苕溪流域的45份水样,结果滴滴涕、六六六等有机氯农药的检出率较高,其他POPs的检出率较低。
Water samples were enriched with Envi-18 SPE cartridge, and 42 POPs compounds were eluted with n-hexane / acetone mixed solvent and determined by GC-MS. By optimizing the instrument monitoring conditions, the target was linear in the range of 0.250 mg / L ~ 5.00 mg / L. The detection limits were 50.9 ng / L ~ 11 640 ng / L. The spiked recoveries were 57.1% ~ 129%. The RSDs were 0.1% ~ 13.8%. The method was applied to the determination of 45 water samples from Dongtang River in Zhejiang Province. As a result, the detection rates of DDT, BHC and other organochlorine pesticides were high, and the detection rates of other POPs were lower.