Particle size distributions and gas-particle partitioning of polychlorinated dibenzo-p-dioxins and dibenzofurans in ambient air during haze days and normal days.
Particle size distributions and gas-particle partitioning of polychlorinated dibenzo-p-dioxins and dibenzofurans in ambient air during haze days and normal days.
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DOI：
10.1016/j.scitotenv.2016.08.198
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
X. Zhang;M. Zheng;Yong Liang;Guorui Liu;Qingqing Zhu;Lirong Gao;Wenbin Liu;K. Xiao;Xu Sun
中科院分区：
文献类型：
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作者：
X. Zhang;M. Zheng;Yong Liang;Guorui Liu;Qingqing Zhu;Lirong Gao;Wenbin Liu;K. Xiao;Xu Sun
关于雾霾期间空气中多氯二苯并对二恶英和二苯并呋喃(PCDD/Fs)的分布，几乎没有信息。本文研究了北京郊区灰霾和平日的PCDD/F浓度、颗粒物分布和气固两相分配。雾霾期间，大气中的二恶英浓度较高，为3979-74,702fg/m−-3(173-3885fg/m-−)，约98%的二恶英/二恶英与颗粒物有关。大多数PCDD/F同系物(>；90%)与颗粒物有关。PCDD/F浓度随着颗粒物尺寸的减小而增加，95%的颗粒结合PCDD/F与空气动力学直径为2.5μm的可吸入细颗粒物有关，PCDD/F主要吸附在颗粒物中，哈纳-比德尔曼模型很好地预测了空气样品中PCDD/F同系物的颗粒物比例。被调查的PCDD/F浓度和颗粒结合分布在平日与灰霾日不同。雾霾条件下郊区空气中多氯二苯并二恶英/氟的时间趋势有助于更好地了解与细颗粒物有关的有毒多氯二苯并二恶英所构成的暴露风险。
Little information is available on the distributions of airborne polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) during haze days. In this study, PCDD/F concentrations, particle size distributions, and gas–particle partitioning in a Beijing suburban area during haze days and normal days were investigated. High PCDD/F concentrations, 3979–74,702 fg m− 3(173–3885 fg I-TEQ m− 3), were found during haze days and ~ 98% of the PCDD/Fs were associated with particles. Most PCDD/F congeners (> 90%) were associated with particles. PCDD/F concentrations increased as particle sizes decreased and 95% of the particle-bound PCDD/Fs were associated with inhalable fine particles with aerodynamic diameters < 2.5 μm. PCDD/Fs were mainly absorbed in the particles and the Harner–Bidleman model predicted the particulate fractions of the PCDD/F congeners in the air samples well. The investigated PCDD/F concentrations and particle-bound distributions were different during normal days than during haze days. Temporal airborne PCDD/F trends in a suburban area during haze conditions could support better understanding of the exposure risk posed by toxic PCDD/Fs associated with fine particles.