沉积物中痕量多环芳烃湿法与干法提取的比较研究

Comparison of Recoveries of PAHs Obtained by Ultrasound-assisted Extraction from Wet and Freeze-dried Marine Sediment

以美国环保局(EPA)优先控制的16种多环芳烃(polycyclic aromatic hydrocarbons,PAHs)为研究对象,建立了湿法超声波辅助萃取技术提取沉积物中痕量PAHs的可靠方法,对萃取剂、萃取功率、萃取次数和萃取时间进行了优化。并与传统干法超声辅助萃取进行了比较,湿法超声波辅助萃取的PAHs回收率为57%～125%,而干法超声波辅助萃取PAHs的回收率为48%～113%,对相对分子质量小的PAHs如萘～芴的回收率,湿法明显高于干法。该文建立的湿法超声辅助萃取适用于沉积物和泥土中痕量PAHs的快速测定。

An ultrasound-assisted extraction method for the extraction of 16 trace PAHs （USEPA priority pollutant） from wet （ i. e. untreated） marine sediment was developed. The effects of solvent type, power of ultrasound, and extraction time were studied and optimized. The developed method was compared with the traditional ultrasound-assisted extraction for freeze-dried sediment. The results showed that recoveries of sixteen PAHs extracted from the wet marine sediment ranged from 57% to 125% , whereas those extracted from the freeze-dried marine sediment ranged from 48% to 113% . The results also indicated that the recoveries of PAHs with smaller relative molecular mass（ e. g. naphthalene and fluorine） extracted from the wet sediment were higher than those from the freeze-dried sediment. Thus the developed method was appropriate for rapid determination of trace PAHs in marine sediment and soil.