河流水体多环芳烃的分布特征及致癌风险评价  

Distribution and carcinogenic risk assessment of PAHs in the river water

作　　者：贾成俊 赵淑莉[2] JIA Cheng-jun;ZHAO Shu-li(Environmental Monitoring Center of Guangzhou City,Guangzhou 510030,China;China National Environmental Monitoring Centre,Beijing 100012,China)

机构地区：[1]广州市环境监测中心站,广东广州510030 [2]中国环境监测总站,北京100012

出　　处：《环境生态学》2022年第10期41-46,共6页Environmental Ecology

基　　金：环境保护部环保公益性行业科研专项(201309045)资助。

摘　　要：采用固相萃取和超声波萃取方法提取了淮河流域典型地区3条河流水体中溶解相、颗粒相和沉积相的多环芳烃,高效液相色谱分析结果表明,沉积相和颗粒相中的多环芳烃的检出浓度(15.42~334.25μg/kg和19.16~49.46 ng/L)明显高于溶解相(0.15~3.05 ng/L),化合物二苯并[a,h]蒽在溶解相和颗粒相都基本未检出,苯并[a]芘的检出浓度基本上超过地表水标准限值2.8 ng/L,河流A水体中的颗粒相和沉积相多环芳烃浓度明显高于河流B和河流C;利用实测值计算的8个采样点的固液分配系数lg K_(p)均大于1,说明多环芳烃在3条河流的水体中更倾向分配吸附于颗粒物和沉积物上,这与多环芳烃的疏水性是一致的;致癌风险评价结果显示,多环芳烃在溶解相中的风险水平大体上在10^(-9)~10^(-8)水平,属于可接受范围,在沉积相和颗粒相中的风险水平大体上在10^(-7)~10^(-6)水平,属于不可接受范围。Extracted the polycyclic aromatic hydrocarbons of dissolved phase,particulate phase and sediment phase by solid phase extraction and ultrasonic extraction respectively from the typical areas Huaihe River three river water,HPLC analysis showed that,particulate phase and deposited phase PAHs detectable concentration(15.42~334.25μg·kg^(-1) and 19.16~49.46 ng·L^(-1)was significantly higher than the dissolved phase(0.15~3.05 ng·L^(-1)),dibenzo[a,h]anthracene were basically undetected in dissolved phase and particulate phase.Benzo[a]pyrene detected concentrations was more than standard limit 2.8 ng·L^(-1) in surface water,the particulate phase and sediment phase PAHs of the river A water were significantly higher than the river B and C.Calculated eight sampling points solid-liquid distribution coefficient lg K _(p) utilizing measured values were greater than 1,showed that PAHs in the three rivers water prefered allocation adsorbed on particulate matter and sediment,this was consistent with hydrophobic of PAHs.The results of the carcinogenic risk assessment showed that the risk level of PAHs in dissolved phase was at the level of 10^(-9) to 10^(-8),it belonged the acceptable range.the risk level of PAHs in particulate phase and deposited phase were at the level of 10^(-7) to 10^(-6),it belonged unacceptable range.

关 键 词：多环芳烃 淮河 分布特征 分配系数 致癌风险评价 

分 类 号：X522[环境科学与工程—环境工程] X592