基于逸度方法的辽东湾海水-沉积物中多环芳烃扩散行为  

Fugacity Approach to Evaluate Sediment-Seawater Diffusion of Polycyclic Aromatic Hydrocarbons in Liaodong Bay,China

作　　者：张玉凤[1,2,3] 杨萌 宋永刚[1,2] 田金[1,2] 赵海勃 李楠[1,2] 吴金浩 

机构地区：[1]辽宁省海洋水产科学研究院,辽宁大连116023 [2]辽宁省海洋环境监测总站,辽宁大连116023 [3]中国海洋大学化学化工学院,山东青岛266100 [4]大连市环境监测中心,辽宁大连116023

出　　处：《环境科学研究》2017年第10期1561-1569,共9页Research of Environmental Sciences

基　　金：辽宁省自然科学基金项目(201602409);辽宁省国家大型仪器设备共享服务能力建设补贴项目(2016);辽宁省海洋与渔业厅科研项目(201518)

摘　　要：为研究辽东湾PAHs(多环芳烃)在海水-沉积物之间的扩散行为,于2014年5月对辽东湾14个采样点海水和沉积物中的16种PAHs进行了调查研究,并采用逸度方法、变异系数、响应系数等统计和计算方法对研究结果进行分析.结果表明:辽东湾海水中ρ(∑PAHs)和沉积物中w(PAHs)的平均变异系数分别为0.25和0.39,属于中等变异,高分子量PAHs的变异系数高于低分子量PAHs;利用ff(逸度分数)评估PAHs在海水-沉积物间的扩散行为,Nap(萘)、Acp(苊)和Fl(芴)表现出从沉积物向海水释放,沉积物是二次释放源;Ace(二氢苊)、Phe(菲)、An(蒽)、Flu(荧蒽)、Pyr(芘)、Ba A(苯并[a]蒽)、Chr(艹屈)在海水-沉积物之间接近平衡状态,5环和6环PAHs则表现出从海水向沉积物沉降富集,沉积物是汇;有机碳和碳黑是影响PAHs在沉积物和海水之间扩散的重要参数.研究显示,7种潜在致癌PAHs[Ba A、Chr、Bb F(苯并[b]荧蒽)、Bk F(苯并[k]荧蒽)、Ba P(苯并[a]芘)、In P(茚并[1,2,3-cd]芘)和Db A(二苯并[a,h]蒽)]海水-沉积物之间的扩散行为可能受到陆源排污和海上石油开发活动的影响.A total of 14 sediment and seawater samples were collected concurrently from Liaodong Bay to evaluate sediment-water diffusion of polycyclic aromatic hydrocarbons（ PAHs）. Concentrations of 16 PAHs were determined by gas chromatography-mass spectrometry（ GC-MS）,and the results were evaluated using the fugacity approach,the coefficient of variation,and the response coefficient. The mean coefficients of variation of the 16 PAHs in seawater and sediment were 0. 25 and 0. 39,respectively,and the coefficients of variation of the 16 PAHs in seawater and sediment showed that there was moderate variation. Also,the coefficients of variation were higher for high molecular weight PAHs than for low molecular weight PAHs. The fugacity fraction（ ff） was calculated from the PAH concentrations in water and sediment,the octanol-water partition coefficient,the sediment organic carbon content,and the sediment density.Nap,Acp,and Fl were transferred from sediment to water and the sediment acted as a secondary source to the seawater.Concentrations of Ace,Phe,An,Flu,Pyr,Ba A,and Chr were close to the sediment-water equilibrium. The sediment acted as a sink for 5-6 ring PAHs from the water column.Sediment-seawater diffusion of PAHs was influenced by sootcarbon and organic carbon,and the sediment-water diffusion of seven carcinogenic PAHs（ Ba A,Chr,Bb F,Bk F,Ba P,In P and Db A）may also be influenced by inputs of land-based sewage and marine activities.

关 键 词：辽东湾 沉积物-海水扩散行为 多环芳烃 逸度方法 

分 类 号：X834[环境科学与工程—环境工程]