摘要
研究利用炭石灰作为反相固定相，萃取水中12种有机氯农药，并用GC／ECD检测。实验表明，炭石灰萃取水中有机氯的效果与商品柱的萃取效果相当，对于200mL添加40ng有机氯农药混合标准溶液水样，其目标化合物的回收率为70％～122％，检出限为0．023～0．124μg／L，多次重复实验测定的相对标准偏差为3．40％～12．9％（n=5）。
The adsorptive potential of active carbon - calcium hydroxide （ACCH） for solid-phase extraction of organoehlorine pesticides in water was investigated for the first time. The analytes were quantitatively adsorbed on an active carbon -calcium hydroxide-packed cartridge, and the analytes retained on the cartridge were quantitatively desorbed with suitable amounts of acetone and hexane. Finally, the analytes in the eluent were measured by gas chromatography. Parameters influencing the extraction efficiency, such as sample solution volume, pH of the sample, solid-phase extraction adsorbent amount, and eluent solution and eluent volume were examined. Comparative studies showed that active carbon - calcium hydroxide was at least as effective as C18 for the extraction of OCPs in water. When the extraction volume was less than 300 mL there was no OCPs detected for saturated OCPs solution. The accuracy of the proposed method was tested by recovery measurements on spiked samples, and good recovery results（70%- 122% ） were obtained compared with liquid- liquid extraction method. The relative standard deviation was from 3.40% to 12.9%. The detection limit of this method ranges from 0. 023 to 0. 124 μg/L for different organochlorine pesticides.
出处
《分析测试学报》
CAS
CSCD
北大核心
2006年第5期30-32,37,共4页
Journal of Instrumental Analysis
基金
国家科技攻关专题(2002BA906A28-3)
国家重点基础研究项目(2003CB415003)
关键词
固相萃取
炭石灰
有机氯农药
Solid-phase extraction
Active carbon -calcium hydroxide
Organochlorine pesticide
