摘要
研究了长江攀枝花、宜宾、泸州、重庆、涪陵、三峡、岳阳、武汉、九江和南京共计10个重点江段枯水期和丰水期表层水中19种多环芳烃(PAHs)及其15种衍生物(SPAHs)的分布和来源,评估了长江PAHs类污染的健康风险及时空差异.结果表明,长江表层水中ΣPAHs、ΣSPAHs平均浓度分别为(147.3±59.8)、(73.2±29.7)ng·L^(-1),检出率分别为82.9%、69.5%,其中2~3环(S)PAHs所占比例为79%.在SPAHs中,ΣNPAHs(硝基取代PAHs)、ΣMPAHs(甲基取代PAHs)、ΣOPAHs(氧化PAHs)的平均浓度分别为(27.0±4.5)、(24.7±15.5)、(17.1±11.9)ng·L^(-1).根据分子比值法及主成分分析可知,长江重点江段PAHs主要来源于生物质、化石及液体燃料燃烧,SPAHs主要来源于燃烧源和光化学转化,SPAHs及PAHs通过大气沉降汇入水体.采用毒性当量因子浓度计算对长江重点江段PAHs进行健康风险评估,结果表明在枯水期具有致癌性PAHs的ΣTEQ_(BaP)值(苯并芘毒性当量)较高,其中岳阳、武汉江段的BaP毒性当量浓度高于我国地表水规定阈值,应当高度重视长江流域PAHs在枯水期引起的健康风险.
The distribution and sources of 19 polycyclic aromatic hydrocarbons and their 15 derivatives in surface water of the Yangtze River were studied during dry and wet seasons,including Panzhihua,Yibin,Luzhou,Chongqing,Fuling,Three Gorges Reservoir,Yueyang,Wuhan,Jiujiang,and Nanjing sections.Besides,the health risk and spatial-temporal differences of PAHs pollution were assessed.The results show that the average concentrations ofΣPAHs andΣSPAHs of the Yangtze River were respectively 147.3±59.8 and 73.2±29.7 ng·L^(-1),and their detection rates were respectively 82.9%and 69.5%,and 2~3 ring PAHs accounted for 79%.For SPAHs,the average concentrations ofΣNPAHs(nitrated⁃PAHs),ΣMPAHs(methyl PAHs),andΣOPAHs(oxygenated⁃PAHs)were 27.0±4.5,24.7±15.5 and 17.1±11.9 ng·L^(-1),respectively.According to the molecular ratio and principal component analysis of the sources of pollutants,biomass,fossil and liquid fuel combustion were the main sources of PAHs.Combustion sources and photochemical conversion were the main sources of SPAHs.Both SPAHs and PAHs mainly entered into water bodies through atmospheric deposition.The health risk of PAHs in the watershed was assessed by calculating the concentration of toxic equivalent factor.The results showed that theΣTEQBaP value(benzopyrene toxicity equivalent)of carcinogenic PAHs in the dry season was relatively higher than that in the wet season.TheΣTEQ_(BaP)values in the Yueyang and Wuhan river sections were higher than the threshold value of Chinese surface water quality standard.Therefore,the health risk caused by PAHs should be focused in the Yangtze River during dry season.
作者
曾超怡
徐辉
许岩
游少鸿
王旭
胡烨
黄适尔
边睿
齐维晓
兰华春
刘会娟
曲久辉
ZENG Chaoyi;XU Hui;XU Yan;YOU Shaohong;WANG Xu;HU Ye;HUANG Shier;BIAN Rui;QI Weixiao;LAN Huachun;LIU Huijuan;QU Jiuhui(School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004;Center for Water and Ecology,School of Environment,Tsinghua University,Beijing 100084;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085;School of Environmental,Northeast Normal University,Changchun 130117)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第12期4932-4941,共10页
Acta Scientiae Circumstantiae
基金
长江重点江段特征污染物识别及其生态风险(No.20192001769)。
关键词
多环芳烃(PAHs)
多环芳烃衍生物(SPAHs)
分布
来源
健康风险
长江
polycyclic aromatic hydrocarbons(PAHs)
substituted polycyclic aromatic hydrocarbons(SPAHs)
distribution
source
health risk
Yangtze river
