Polycyclic aromatic hydrocarbons (PAHs) in a sediment core from Lake Taihu and their associations with sedimentary organic matter  

作　　者：Yong He Xiangyu Wang Zhaobin Zhang 

机构地区：[1]College of Urban and Environmental Sciences,Peking University,Beijing 100871,China

出　　处：《Journal of Environmental Sciences》2023年第7期79-89,共11页环境科学学报（英文版）

基　　金：The first author,Yong He,is funded by the Shanghai Tongji Gao Tingyao Environmental Science&Technology Development Foundation(STGEF).This work is also supported by the Field Practice of Environmental Sciences from College of Urban&Environmental Sciences(CUES),Peking University.The authors thank those who participated in field sampling works and those who gave necessary assistance.Yong He also thanks the Instrument Platform of CUES for GC-MS support.The Article Publishing Charge(APC)is paid by Yong He using his scholarship received from STGEF.

摘　　要：Sediment core is the recorder of polycyclic aromatic hydrocarbon(PAH)pollutions and the associated sedimentary organic matter(SOM),acting as crucial supports for pollution control and environmental management.Here,the sedimentary records of PAHs and SOM in the past century in Lake Taihu,China,were reconstructed from a 50-cm sediment core.On the one hand,the presence of PAHs ranged from 8.99 to 199.2 ng/g.Vertically,PAHs declined with the depth increased,and the sedimentation history of PAHswas divided into two stages with a discontinuity at 20 cm depth.In composition,PAHs in the sediment core were dominated by three-ring PAHs(44.6%±9.1%,mean±standard deviation),and were followed by four-ring(27.0%±3.3%),and five-ring(12.1%±4.0%)PAHs.In toxicity assessment,the sedimentary records of benzo[a]pyrene-based toxic equivalency were well described by an exponential model with R-square of 0.95,and the environmental background toxic value was identified as 1.62 ng/g.On the other hand,different components of SOM were successfully identified by n-alkanemarkers(p<0.01)and the variations of SOMwerewell explained(84.6%).A discontinuity of SOM was recognized at 22 cm depth.Association study showed that the sedimentary PAHs were associated with both anthropogenic and biogenic SOM(p<0.05)with explained variances for most individual PAHs of 60%.It indicated the vertical distributions of PAHs were driven by sedimentary SOM.Therefore,environmental processes such as biogenic factors should attract more attentions as well as PAH emissions to reduce the impacts of PAHs.

关 键 词：Polycyclic aromatic hydrocarbons (PAHs) N-ALKANES Sedimentary records COMPOSITION Toxicity assessment Lake Taihu 

分 类 号：X524[环境科学与工程—环境工程]