Analysis of Organic Pollutants in Dust by Supercritical Fluid Extraction

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 benzoα 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.