• 关键词：河蚬  多环芳烃  生物富集  生物-沉积物生物富集因子  太湖  沉积物

• 基金项目：国家自然科学基金项目(No.20507019);国家重点基础研究发展计划项目(No.2003CB415005)

• 李天云
• 1. 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085; 2. 西南大学资源与环境学院, 重庆 400716

• 黄圣彪
• 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085

• 孙凡
• 西南大学资源与环境学院, 重庆 400716

• 查金苗
• 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085

• 乔敏
• 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085

• 王子健
• 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085

• 摘要：以采自清洁水体的河蚬(Corbicula fluminea)为实验生物,利用生物富集实验测试了河蚬对太湖梅梁湾水源地沉积物中多环芳烃的生物富集.研究结果表明:将河蚬暴露于多环芳烃污染程度不同的太湖梅梁湾沉积物中(PAHs总含量分别为991.4～1210.9ng·g^-1(以干重计),平均为1101.0ng·g^-1),暴露7d后各样点中河蚬对PAHs的富集量为233.5～342.6ng·g^-1,其中2、3、4环PAHs分别占总含量的23.5%±4.9%、26.2%±4.4%和46.6%±8.5%;含量最高的4种多环芳烃依次为芘、萘、菲和荧蒽,它们所占的比例分别为29.4%±8.2%、23.5%±4.9%、14.6%±6.1%和12.5%±3.6%.河蚬对多环芳烃的生物-沉积物生物富集因子(BSAF)为0.09～0.44,低分子量多环芳烃的BSAF要比高分子量多环芳烃的BSAF值高,其中芘、萘、菲和荧蒽的BSAF值分别为0.09±0.04、0.24±0.04、0.44±0.23和0.19±0.09.

• Abstract：Bioaccumulation of sediment-associated polycyclic aromatic hydrocarbons(PAHs)in Meiliang Bay,Taihu Lake,was assessed using a benthic organism,the Asiatic clam (Corbicula fluminea) collected from clean water.The total concentrations of PAHs in the sediment samples were 991.4 to 1210.9 ng·g^-1 dry weight.After 7-day exposures to different sediments,concentrations of total PAHs in Asiatic clam muscle ranged from 233.5 to 342.6 ng·g^-1(dry weight).Most of the PAHs in the Asiatic clams were 2-,3-and 4-ring PAHs and the proportion to total PAHs in the organisms were 23.5%±4.9%,26.2%±4.4% and 46.6%±8.5%,respectively.The four most abundant PAHs accumulated by Corbicula fluminea were pyrene,naphthalene,phenanthrene,and fluoranthene,representing 29.4% 8.2%,23.5%±4.9%,14.6%±6.1% and 12.5%±3.6% of the total PAHs in the organisms,respectively.The biota-sediment accumulation factors (BSAFs) calculated for Corbicula fluminea to PAHs ranged from 0.09 to 0.44,and the BSAF values for pyrene,naphthalene,phenanthrene,and fluoranthene were 0.09±0.04,0.24±0.04,0.44±0.23 and 0.19±0.09,respectively.The BSAF values were higher for low molecular weight PAHs than for high molecular weight PAHs.

• Key words：asiatic clam(Corbicula fluminea)  polycyclic aromatic hydrocarbons(PAHs)  bioaccumulation  biota-sediment accumulation factors(BSAF)  Taihu Lake  sediment

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