摘要
利用淡水单孔蚓Monopylephorus limosus的生物富集实验,研究了黑碳对土壤和沉积物中多环芳烃类有机化合物菲生物可利用性的影响,同时研究了黑碳对菲吸附和解吸行为的影响,并用"双元平衡解吸(DED)模型"对解吸行为进行了预测.结果表明,土壤和沉积物中黑碳的存在直接导致了菲在颤蚓体内的生物累积因子(BSAF)的降低,其原因在于菲在黑碳沉积物样品中的不可逆吸附程度的显著增强.研究发现,土壤和沉积物中菲的生物可利用性与土壤和沉积物中菲的吸附相浓度无关而与孔隙水浓度密切相关.
Bioavailability of soil-and sediment-bound phenanthrene was investigated using bioaccumulation test with Monopylephorus limosus.The effects of black carbon on sorption and desorption of phenanthrene in soil and sediment were also examined,and the desorption results were compared with the prediction of a ＂Dual-Equilibrium Desorption（DED）＂ model.The biota-soil/sediment accumulation factor（BSAF） of phenanthrene decreased in black carbon amended soil and Bohai sediment by 29% and 38%,respectively.The decrease of bioavailability was due to the enhanced phenanthrene sorption as well as enhanced desorption hysteresis in the presence of black carbon.The results indicate that bioavailability correlates well with phenanthrene concentrations in the pore water but not the concentrations in the bulk soil or sediment.
出处
《环境化学》
CAS
CSCD
北大核心
2010年第5期848-855,共8页
Environmental Chemistry
基金
科技部国际科技合作项目(2009DFA91910)
