摘要
采用超临界流体萃取与气相色谱／质谱联用技术对兰州市大气Ｄ飘尘中有机污染物进行了测定。实验考察了对强致癌性化合物多环芳烃类萃取的最佳条件，在２６．０ＭＰａ，８０℃下，０．５ｍＬ甲醇做改性剂，用ＣＯ２作为超临界萃取介质，静态萃取１０ｍｉｎ后再以０．５ｍＬ／ｍｉｎ的流速动态萃取３０ｍｉｎ，对实际样品进行了定性定量分析，共检测出６９种有机污染物。该方法简便、快速。
Methods of Supercritical Fluid Extraction (SFE) have been used for concentrating organic pollutants in the atmospheric dust. Four factors (extraction pressure, temperature, time and modifier) were studied for the effects on SFE, the conditions selected were 26.0 MPa,80 ,0.5 mL methanol as modifier and 30 min of extraction time. Finally, the extracts were injected into a capillary GC/MS without further concentration. In this manner, 69 organic pollutants including 15 PAHs were detected in the Lanzhou city atmospheric dust. The concentration of benzo pyrene in this analysis also compared to that of other experiments all over the world. The study shows the proposed method is simple and timesparing and it is suitable to the analysis of the organic pollutants in dust.
出处
《分析测试技术与仪器》
CAS
1999年第2期89-93,共5页
Analysis and Testing Technology and Instruments
关键词
超临界流体萃取
飘尘
有机污染物
二氧化碳
测定
Supercritical Fluid Extraction
Dust
Organic Pollutants
Supercritical carbon dioxide
