长江口南支表层沉积物中多环芳烃分布特征及生态风险  

Distribution characteristics and ecological risk of polycyclic aromatic hydrocarbons in surface sediments of south branch of Yangtze River estuary

作　　者：晁敏[1] 伦凤霞[1] 沈新强[1] 

机构地区：[1]中国水产科学研究院东海水产研究所农业部海洋和河口渔业重点开放实验室,上海200090

出　　处：《生态学杂志》2010年第1期79-83,共5页Chinese Journal of Ecology

基　　金：中央级公益性科研院所基本科研业务费专项资金(中国水产科学研究院东海水产研究所)资助项目(2007M02)

摘　　要：2008年5月和8月先后2次采集长江口南支表层沉积物样品,采用高效液相色谱进行多环芳烃测定,研究其分布、来源与生态风险。结果表明：长江口南支表层沉积物中PAHs总量在8.9-312.2ng·g^-1;PAHs组成以芘、菲、苯并[b]荧蒽、苯并[a]蒽、苯并[a]芘为主,各站芘的含量均最高,本研究PAHs总含量与长江口、黄河口和鸭绿江口近期的调查数据相近,但明显低于珠江口和闽江口数据,以及长江口潮滩沉积物中PAHs数据;PAHs环数组成以中、高环为主,表明长江口南支PAHs主要来源于相对高温条件下不完全燃烧过程。采用平均效应中值商法评价长江口南支PAHs生态风险结果表明,调查区域PAHs产生生态风险的概率较小（〈10%）。Sediment samples were collected from the south branch of Yangtze River estuary in May and October 2008, and their polycyclic aromatic hydrocarbons （PAHs） concentrations were analyzed by HPLC, aimed to study the distribution, source, and ecologicalrisk of the PAHs. The total concentration of PAHs in the sediments ranged in 8. 9-312. 2 ng·g^-1, and the PAHs were mainly constituted by Pyr, Phe, BbF, BaA, and BaP, with the highest concentration of Pyr. The total concentration of PAHs in test sediments was very similar to the published data for the Yangtze River estuary, Huanghe River estuary, and Yalu River esttiary, but was significantly lower than those for the Pearl River estuary, Mingjiang River estuary, and tidal flats of Yangtze River estuary. In the PAHs, those with 4-6 tings were the dominant, suggesting that the main source of the PAHs was of pyrogenic. The assessment by the method of mean effects median quotient demonstrated that the PAHs in test sediments had very low probability （ 〈 10% ） of ecological risk.

关 键 词：长江口 表层沉积物 多环芳烃 生态风险评价 

分 类 号：X824[环境科学与工程—环境工程]