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为掌握渤海湾天津段多条河流入海区和海滨旅游度假区的近岸海域表层(0~5 cm)沉积物中PAHs(多环芳烃)的污染状况,对该区域表层沉积物中16种US EPA(美国国家环境保护局)优先控制PAHs的分布特征及其来源进行了调查和分析,并评估了其潜在生态风险和概率致癌风险.结果表明:渤海湾天津近岸海域表层沉积物中w(PAHs)(16种PAHs质量分数之和,以干质量计)为23.9~672.8 ng/g,平均值为228.1 ng/g.表层沉积物中PAHs的污染程度与历史调查结果相比有所加剧,并且呈复合型污染,在天津港港区外海域主要为石油制品污染,在研究区域南部则主要源于燃煤和生物质的不完全燃烧.风险评估结果表明,海河入海口附近和研究区域北部存在潜在生态风险;研究区域内概率致癌风险处于较低水平,∑7TEQBaP(7种强致癌PAHs的苯并[a]芘毒性当量浓度之和)占∑16TEQBaP〔16种PAHs的苯并[a]芘毒性当量浓度之和〕的96.8%,其中二苯并[ah]蒽的致癌风险最大,其次为苯并[a]芘.
In order to understand the pollution status of PAHs in surface sediments (0 ~ 5 cm) in the offshore area of the coastal area from Tianjin to Tianjin and several seaside resorts, 16 kinds of US The EPA (National Environmental Protection Agency) preferentially controlled the distribution characteristics of PAHs and their origins, and assessed their potential ecological risk and probability of carcinogenic risk.The results show that the distribution of w ( PAHs) (the sum of 16 PAHs mass fractions on a dry mass basis) ranged from 23.9 to 672.8 ng / g, with an average of 228.1 ng / g.The extent of PAHs contamination in surface sediments was aggravated compared to historical findings, Which was mainly polluted by petroleum products in the waters outside the port of Tianjin Port and incomplete combustion of coal and biomass in the southern part of the study area.The results of risk assessment showed that the sea near the mouth of the Haihe River and the northern part of the study area There is a potential ecological risk; the risk of probable carcinogenicity in the study area is at a low level, Σ7TEQBaP (the sum of benzo [a] pyrene toxic equivalent concentrations of seven strong carcinogenic PAHs) accounts for Σ16TEQBaP [benzo [a] Pyrene toxic equivalent concentration and Of 96.8%, in which a dibenzo [AH] anthracene maximum cancer risk, followed by benzo [a] pyrene.