东莞市夏季大气颗粒物中的多环芳烃及硝基多环芳烃
Study of polycyclic aromatic hydrocarbons and nitro-polycyclic aromatic hydrocarbons in atmospheric particles in Dongguan
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摘要: 以东莞市2011年夏季不同区域的大气颗粒物为研究对象,定性定量分析了其中多环芳烃(PAHs)及硝基多环芳烃(NPAHs)的浓度、组成.采用特征比值法分析了PAHs及NPAHs的来源,并通过PEFs毒性评价法评价了颗粒物中多环芳烃及硝基多环芳烃的BaP等效毒性,估算出个体致癌指数.结果表明东莞市颗粒物上16种多环芳烃总含量在12.60—193.95 ng·m-3范围内,6种硝基多环芳烃的总含量在5.88—62.79 ng·m-3,隧道环境中多环芳烃及硝基多环芳烃的浓度最高.除隧道环境中颗粒物的等效毒性及个体致癌指数超标外,东莞市颗粒物上PAHs及NPAHs对人体均不构成严重威胁.Abstract: The concentrations and compositions of polycyclic aromatic hydrocarbons(PAHs) and nitro-polycyclic aromatic hydrocarbons(NPAHs) in the atmospheric particles in different regions of Dongguan were studied. The possible sources of PAHs and NPAHs were estimated by some specific values. The BaP equivalent toxicity of polycyclic aromatic hydrocarbons and nitro-polycyclic aromatic hydrocarbons in the particulate matter were evaluated by the PEFs, and the individual carcinogenicity index was calculated. The results showed that the total content of the 16 PAHs and 6 NPAHs in atmosphereic particles in Dongguan were in the range of 12.60—193.95 ng·m-3 and 5.88—62.79 ng·m-3, repectively. The concentrations of PAHs and NPAHs in tunnel environment were the highest. The [BaPeq] and the individual carcinogenic index of PAHs and NPAHs exceeded the discharge standard in China in the tunnel environment, but it was not a serious threat to human in other areas of Dongguan.
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Key words:
- atmospheric particles /
- PAHs /
- NPAHs /
- toxicity evaluation
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