Spatial distribution of polychlorinated naphthalenes in the atmosphere across North China based on gridded field observations

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• 作者：Yan Lin ; Yifan Zhao ; Xinghua Qiu ; Jin Ma ; Qiaoyun Yang ; Min Shao ; Tong Zhu
• 关键词：Polychlorinated naphthalene ; Atmosphere ; Source ; Passive air sampling ; North China
• 刊名：Environmental Pollution
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：180
• 期：Complete
• 页码：27-33
• 全文大小：640 K

文摘

Polychlorinated naphthalenes (PCNs) belong to a group of dioxin-like pollutants; however little information is available on PCNs in North China. In this study, gridded field observations by passive air sampling at 90 sites were undertaken to determine the levels, spatial distributions, and sources of PCNs in the atmosphere of North China. A median concentration of 48?pg?m^?3 (range: 10-2460?pg?m^?3) for ¡Æ₂₉PCNs indicated heavy PCN pollution. The compositional profile indicated that nearly 90 % of PCNs observed were from thermal processes rather than from commercial mixtures. Regarding the source type, a quantitative apportionment suggested that local non-point emissions contributed two-thirds of the total PCNs observed in the study, whereas a point source of electronic-waste recycling site contributed a quarter of total PCNs. The estimated toxic equivalent quantity for dioxin-like PCNs ranged from 0.97 to 687?fg TEQ?m^?3, with the electronic-waste recycling site with the highest risk.