摘要
文章研究基于2018-2021年济南市典型城区大气苯系物监测数据,利用·OH消耗速率(L·OH)和臭氧生成潜势(OFP)分析化学活性特征,采用主成分分析法探讨其主要来源,并评价苯系物健康风险。结果显示济南市苯系物质量浓度(17.18±16.06)μg/m^(3),冬季明显高于其他季节,夏季浓度最低,甲苯、苯和1,3,5-三甲苯为浓度较高的物种;苯系物L·OH和OFP分别为(1.59±3.05)s^(-1)、(79.12±88.22)μg/m^(3),均为冬季最高,关键活性组分有1,3,5-三甲苯、苯乙烯、1,2,3-三甲苯、甲苯和1,2,4-三甲苯;主成分分析法结果显示苯系物主要源类为溶剂使用源、石油化工源和机动车排放源;苯系物非致癌风险HI为4.23×10^(-2),处于安全范围(HI<1),致癌风险4.51×10^(-6),高于安全阈值(10^(-6)),存在致癌风险。
Based on the concentrations of benzene homologues in typical city atmospheric environment sampling site in Jinan from 2018 to 2021,the chemical activity characteristics were analyzed by hydroxyl radical(·OH)loss rate(L·OH)and ozone formation potential(OFP).The health risks of benzene homologues were also assessed.The origins of benzene homologues were studied by principal component analysis.Results showed that the concentration of atmospheric benzene homologues in Jinan was(17.18±16.06)μg/m^(3),while the concentration in winter was highest and lowest in summer and the concentration of toluene,benzene and 1,3,5-trimethylbenzene were relatively large.The L·OHand OFP of benzene homologues were(1.59±3.05)s^(-1)and(79.12±88.22)μg/m^(3)respectively and with highest values in winter.The key active components were 1,3,5-trimethylbenzene,styrene,1,2,3-trimethylbenzene,methylbenzene and 1,2,4-trimethylbenzene.The benzene homologues were mainly affected by emissions from solvent evaporation,petrochemical industry,traffic sources and coal burning.The value of hazard index was 4.23×10^(-2),which was lower than the US EPA recommended safety threshold(HI=1),while the carcinogenic risk was 4.51×10^(-6)and higher than the safety threshold(10^(-6)),indicating that there was a potential carcinogenic risk to exposed people.
作者
刘杨
孙晓艳
代雪静
范国兰
杜明月
杜天君
LIU Yang;SUN Xiaoyan;DAI Xuejing;FAN Guolan;DU Mingyue;DU Tianjun(Jinan Ecological and Environmental Monitoring Center,Jinan 250101,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第12期164-173,共10页
Environmental Science & Technology
基金
国家大气重污染成因与治理攻关项目:细颗粒物和臭氧污染协同防控“一市一策”驻点跟踪研究(DQGG202118)。
关键词
苯系物
化学活性特征
健康风险评价
主成分分析
benzene homologues
chemical activity characteristics
health risks
principal component analysis
