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研究报告

基金项目：南京大学污染控制与资源化研究国家重点实验室开放基金项目(No.PCRRF09012);教育部博士点专项基金资助项目(No.20090076120022);国家自然科学基金项目(No.40901256,40971268);归国留学人员启动基金项目

晏彩霞
1. 南京大学污染控制与资源化研究国家重点实验室, 南京 210093; 2. 华东师范大学资源与环境科学学院, 地理信息科学教育部重点实验室, 上海 200062

摘要：以菲为多环芳烃的代表物,对长江口滨岸带潮滩沉积物进行吸附实验,并研究不同盐度、营养盐和温度条件下和不同沉积物组分对吸附的影响.结果表明,Freundlich吸附等温线能较好的拟合实验值,其K_Fr值与各样点TOC含量变化趋势一致,而非线性特征随样品TOC含量升高及吸附能力的增强而降低.盐度对吸附略有影响,而对于TOC含量较低的样品并无影响.营养盐存在条件下对吸附也没有显著的影响.随温度升高,沉积物吸附能力略有增强,但非线性特征变化不明显.对样品进行分级处理以去除无机碳和有机碳,在此基础上进行吸附实验,结果表明无机碳对吸附贡献不大,而有机碳则是主导吸附的重要组分之一,且其吸附等温线拟合参数值符合经验方程预测值.对于吴淞口样品(TOC>1%)来说,有机碳控制整个吸附过程;而对于老港垃圾场样品(0.1%<TOC<1%)来说,有机碳在高浓度时控制了吸附过程,而在低浓度时贡献率则较低(<50%).

Abstract：Phenanthrene was chosen as a probe compound and representative of PAHs to determine equilibrium sorption isotherms for tidal sediments from the Yangtze River Estuary. To study the factors that influence the sorption process,sorption experiments were performed at different salinities,nutrient salt concentrations and temperatures and with different sediment fractions. The results showed that the Freundlich model fit the experimental data well. With the increased TOCcontents,K_Fr values increased,while n values decreased. Salinity had slight impact on the sorption,but no influence was seen for samples with low TOC. Moreover,nutrient concentrations did not show significant influence on the sorption isotherms. Sorption capacities grew slightly higher at higher temperature,but the nvalues were stable. Samples were treated sequentially to remove inorganic and organic carbon. Sorption experiments with treated samples showed that the contribution of the inorganic carbon to the total sorption was insignificant,while organic carbon (OC) played an important role in the total sorption. OCcontrolled the whole sorption in Wusongkou(WSK)samples with TOC>1%; whereas for Laogang(LG) samples with 0.1%<TOC<1%,OCdominated the sorption at relatively high Cw,while it contributed less than 50% of the total sorption at lower C_w concentrations.