Phase distribution, sources and risk assessment of PAHs, NPAHs and OPAHs in a rural site of Pearl River Delta region, China
Phase distribution, sources and risk assessment of PAHs, NPAHs and OPAHs in a rural site of Pearl River Delta region, China
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DOI：
10.5094/apr.2014.026
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发表时间：
2014-04-01
影响因子：
4.5
通讯作者：
Fu, Jiamo
中科院分区：
文献类型：
--
作者：
Huang, Bo;Liu, Ming;Fu, Jiamo
气体和颗粒物样本于2010年深秋从珠江三角洲(珠江三角洲)的农村地区万青沙(WQS)采集，中国。测定了18种多环芳烃(PAHs)、29种硝化多环芳烃(NPAHs)和6种含氧多环芳烃(Opahs)，讨论了它们的气固分配、来源和危害。结果表明，大气质量分布以三环和四环化合物为主。菲、2-硝基荧菲和苯并三酮分别是最丰富的母体多环芳烃、NPAH和opah。这些化合物的分配强烈依赖于它们的相对分子质量。与吸附模型相比，吸附模型能更好地预测多环芳烃的颗粒物含量，可用于多环芳烃衍生物来源的判别。分子诊断比表明，WQS的主要来源是燃煤或生物质燃烧，而不是机动车排放。2-硝基荧菲/2-硝基并菲和2-硝基荧菲/1-硝基并芘的比值表明，羟基引发的二次生成是NPAHs的主要生成途径，采样期间NPAHs的平均贡献率为92.6%，在雾霾条件下可能会促进NPAHs的生成。大多数欧帕鱼受到地区性污染的影响。风险评估显示，总的终生过量吸入性癌症风险为1.12x10(-5)，其中计算的6种NPAH贡献了3.5%，尽管它们只占评估使用的18种化合物的0.7%。
Gaseous and particulate samples were collected in the late autumn of 2010 from Wanqingsha (WQS), a rural site in the Pearl River Delta (PRD) region, China. Eighteen polycyclic aromatic hydrocarbons (PAHs), twenty-nine nitrated PAHs (NPAHs) and six oxygenated PAHs (OPAHs) were measured, and their gas-particle partitioning, sources and risks were discussed. The results showed that the atmospheric mass distribution was dominated by three and four rings compounds. Phenanthrene, 2-nitrofluoranthene and benzanthrone were the most abundant parent PAH, NPAH and OPAH, respectively. The partitioning of these compounds was strongly dependent on their molecular weights. The absorption model provides a better prediction of the particulate fraction of PAHs than the adsorption model, and might be applied for the discrimination of PAH derivatives sources. Molecular diagnostic ratios suggested that coal combustion or biomass burning, not vehicle emission, were the dominant sources in WQS. The ratios of 2-nitrofluoranthene/2nitropyrene and 2-nirtofluoranthene/1-nitropyrene indicated that secondary formation by OH initiated reactions was the main formation pathway for NPAHs, with an average contribution of 92.6% during the sampling period, and the formation might be enhanced under hazy conditions. Most of OPAHs were under the impact of regional pollution. Risk assessment showed an overall lifetime excess inhalation cancer risk of 1.12x10(-5) in which the six NPAHs taken into calculation contributed 3.5% although they only accounted for 0.7% of the 18 compound masses used in the assessment.