Nilsson Tobias, Häkkinen Johan, Larsson Per, Björklund Erland
Department of Analytical Chemistry, Lund University, P.O. Box 124, 221 00 Lund, Sweden.
Environ Pollut. 2006 Mar;140(1):87-94. doi: 10.1016/j.envpol.2005.06.021. Epub 2005 Sep 26.
A naturally contaminated sediment was partially extracted with selective supercritical fluid extraction (SFE) to remove a fraction of supposedly bioavailable PCBs from the matrix. Eels (Anguilla anguilla) were cultured in systems with untreated and pre-extracted sediment, respectively, and it was shown that the SFE treatment selectively removed bioavailable PCBs from the sediment, since relative biota-to-sediment accumulation factors (BSAFs) for the eight studied PCB congeners were much lower in the pre-extracted than in the untreated system at the end of the study. Relative BSAF values decreased with about the same relative amount for all eight congeners, independent of the degree of chlorination and the initial concentration in the sediment. The results demonstrate the ability of SFE to selectively remove sediment-bound PCBs that are available for uptake by the eels, thus demonstrating the feasibility of using selective SFE to estimate bioavailability of PCBs in sediments.
采用选择性超临界流体萃取（SFE）对天然污染沉积物进行部分萃取，以从基质中去除一部分假定具有生物可利用性的多氯联苯。分别在含有未处理沉积物和预萃取沉积物的系统中养殖鳗鱼（欧洲鳗鲡），结果表明，SFE处理可选择性地从沉积物中去除生物可利用的多氯联苯，因为在研究结束时，对于所研究的8种多氯联苯同系物，预萃取系统中的相对生物群-沉积物积累因子（BSAFs）远低于未处理系统。所有8种同系物的相对BSAF值均以大致相同的相对量下降，与氯化程度和沉积物中的初始浓度无关。结果表明，SFE能够选择性地去除沉积物中可被鳗鱼摄取的多氯联苯，从而证明了使用选择性SFE评估沉积物中多氯联苯生物可利用性的可行性。
