潭江表层沉积物中多环芳烃分布特征及其生态风险评价  

Distribution Characteristics and Ecological Risk Assessment of Polycyclic Aromatic Hydrocarbons in Surface Sediments from Tanjiang River

作　　者：李艳静[1,2] 汪光[2,3] 李开明[2,3] 陈中颖[2,3] 陆俊卿[2,3] 刘晓伟[2,3] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]环境保护部华南环境科学研究所国家环境保护水环境模拟与污染控制重点实验室,广东广州510655 [3]广东省水与大气污染防治重点实验室,广东广州510655

出　　处：《环境科学与技术》2014年第2期167-173,共7页Environmental Science & Technology

基　　金：国家自然科学基金项目(21207046);广东省自然科学基金项目(S2012010008396;10451065501005843);国家水体污染控制与治理科技重大专项(2009ZX07528-001)

摘　　要：为分析潭江沉积物的多环芳烃污染特征及来源，评估其生态风险，对潭江15个采样点表层沉积物中16种多环芳烃单体的含量进行了测定。沉积物多环芳烃总含量范围为57．1—1563．6ngg，平均值为550．5ngg。整体来看，潭江沉积物多环芳烃污染处于中等偏污染水平。多环芳烃组成以4-6环为主。潭江沉积物同时受到相邻区域远距离迁移和本地燃烧源很大程度的影响，此外石油排放也是中下游沉积物中多环芳烃的重要来源。风险评价结果表明，除最下游的采样点15外，潭江各采样点风险均较低，但是在部分采样点某些多环芳烃含量超过了效应区间低值（ERL），可能存在着对生物的潜在危害。Distribution characteristics and sources of polycyclic aromatic hydrocarbons （PAHs） in surface sediment of 15 sites from Tanjiang River in China were analyzed. Results indicated that the concentration of PAHs varied from 57.1 to 1 563.6 ng/g and the average was 550.5 ng/g. In general, it was appeared to be moderate to low level pollution by PAHs in the River. The spectrum of PAHs showed that 4 to 6 ring PAHs were predominant. The sources of long distance migration and local combustion affected the concentration level of PAHs, and discharge of oil also played an important role in most sites of midstream and downstream. Ecological risk assessment result indicated that the degree of ecological risk assessment was all at very low level, except Site 15. Some of PAHs exceeded ERL in some sites, and potential harmful effects on creatures might exist.

关 键 词：多环芳烃 潭江 表层沉积物 生态风险评价 

分 类 号：X820.4[环境科学与工程—环境工程]