红枫湖多环芳烃的高分辨沉积记录  

High-resolution sedimentary records of polycyclic aromatic hydrocarbons in Hongfeng Lake of Southwest China

作　　者：李秋华[1,2] 郭建阳[1] 朱元荣[3] 张瑞卿[3] 李笑路 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [2]贵州师范大学贵州省山地环境信息系统和生态环境保护重点实验室,贵阳550001 [3]中国环境科学研究院湖泊生态环境研究中心国家环境保护湖泊污染国家重点实验室,北京100080 [4]江西省赣中南地质矿产勘察研究院,南昌330029

出　　处：《生态学杂志》2013年第9期2424-2432,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(40973087);国家重点基础研究发展计划前期项目(2012CB426506)资助

摘　　要：用GC/MS方法分析了红枫湖沉积柱中16种美国EPA优控多环芳烃(PAHs)的垂直分布状况,并对其组成特征、来源及其生态风险进行了分析。结果表明:红枫湖沉积柱中PAHs含量为848～3725 ng·g-1,并在20世纪90年代中期达到峰值;这明显不同于发达国家的同类研究,也与我国沿海地区和其他湖泊有所不同;红枫湖沉积物中PAHs主要来自家庭燃煤、木材和生物秸秆等的中低温燃烧过程,但工业燃煤和机动车尾气等高温燃烧过程释放的PAHs的相对含量近年来有明显增加的趋势;风险评估结果显示,红枫湖沉积物中的低环数PAHs,如NAP、FLU和PHEN可能导致潜在的生态风险,但从毒性当量的角度看,沉积物的生态风险主要来自高环数的BbF、BaP和DBA。By using GC/MS method, this paper analyzed the vertical profiles of 16 priority poly- cyclic aromatic hydrocarbons （PAHs） proposed by US EPA in a sediment core collected from the Hongfeng Lake in Southwest China. Meanwhile, the composition characteristics of the PAHs, their possible sources, and their ecological risks were discussed. The total PAHs concentrations in the sediment core ranged from 848 to 3725 ng ~ g-i, with a peak in the mid-1990s. The verti- cal profiles of the PAHs were not only different from those in developed countries, but also differ- ent from those in the coastline and other regions lakes in China. The PAHs in Hongfeng Lake were mainly come from the low temperature combustion of domestic coal and bioinass burning. However, the relative abundance of the PAHs from high temperature combustion processes, such as the combustion of industrial coal and vehicle emission, was increased significantly in recent years. The risk assessment suggested that the low rings PAHs such as NAP, FLU, and PHEN in the sediment of Hongfeng Lake could induce potential ecological risks. However, from the view- point of toxic equivalency quotient, the ecological risks were mainly originated from the high rings PAHs such as BbF, BaP, and DBA.

关 键 词：多环芳烃 沉积柱 来源 风险评估 红枫湖 

分 类 号：X832[环境科学与工程—环境工程]