枯、平、丰水期长江3条支流表层水中多氯联苯的分布特征及风险评价  

Distribution Characteristics and Potential Risk of PCBs in Surface Water from Three Tributaries of Yangtze River in Different Periods

作　　者：李昆[1,2] 赵高峰[1] 周怀东[1] 曾敏[2] 廖柏寒[2] 吴正勇[1,2] 张盼伟[1,2] 柳敏[3] 

机构地区：[1]中国水利水电科学研究院,北京100038 [2]中南林业科技大学林学院,长沙410004 [3]兰州大学资源环境学院,兰州730000

出　　处：《环境科学》2012年第8期2574-2579,共6页Environmental Science

基　　金：中国水利水电科学研究院青年基金项目(环集1113;环集1233);国家水体污染控制与治理科技重大专项(2012ZX07203-006;2008ZX07209;2009ZX07527);国家创新研究群体基金项目(51021006)

摘　　要：采用GC-MS/MS技术对长江3条支流(沱江、藕池河下游和松澧洪道)在不同水期的81个表层水样进行分析.实验发现样品表层水样中PCB8、18和28是优势污染物.ΣPCBs在沱江、藕池河下游和松澧洪道3条支流不同水期表层水中的几何均值分别为1.96～2.59 ng.L-1、1.84～2.54 ng.L-1和1.52～2.38 ng.L-1,含量均低于美国EPA连续暴露基准(14ng.L-1).实验结果与国内外相关文献报道值相比较,显示该研究区域表层水中PCBs浓度处于较低水平,癌症风险评价结果表明饮用该区域水摄入PCBs而带来的风险为0.15×10-7～0.26×10-7,说明研究区水样中因PCBs污染引起的癌症风险较低.Eighty-one surface water samples were collected from 3 tributaries of the Yangtze River in different periods.Contents of 28 PCB congeners in surface water samples were measured using Varian CP3800/300 GC-MS/MS technique.PCB8,18,and 28 are the most predominant PCB congeners in the samples from tributaries.The measured level of PCBs in the samples from the Tuo river、 downstream of Ouchi river and Songlihongdao tributary were 1.96-2.59 ng·L-1,1.84-2.54 ng·L-1 and 1.52-2.38 ng·L-1.The average concentrations of PCBs in the samples were lower than USEPA criterion continuous concentration（14 ng·L-1）,which were also in the same order of magnitude of those reported with lower levels in European and American countries.The estimated cumulative cancer risk for the local residents who drink water from tributaries were 0.15×10-7-0.26×10-7,which shows that cancer risk are negligible due to PCBs contamination in these samples.

关 键 词：长江支流 表层水 多氯联苯 污染特征 风险 

分 类 号：X820.4[环境科学与工程—环境工程]