Atmospheric polycyclic aromatic hydrocarbons in north China: A winter-time study
Atmospheric polycyclic aromatic hydrocarbons in north China: A winter-time study
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DOI：
10.1021/es0716249
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发表时间：
2007-12-15
影响因子：
11.4
通讯作者：
Gao, Yuan
中科院分区：
文献类型：
--
作者：
Liu, Shuzhen;Tao, Shu;Gao, Yuan
对总面积达30万km(2)、PAH排放密度较高的北方平原地区大气多环芳烃(PAHs)污染及外流情况进行了调查。 2005年11月至2006年2月冬季，在城市、农村（城镇或村庄）和控制区（边远山区）的46个地点采集了聚氨酯泡沫（PUF）和PM10样品。观测到的大气PAHs浓度普遍高于发达国家和中国南方城市的报告值。结果发现，城市和农村地区空气中PAH浓度没有显着差异（分别为514±563ng/m（3）和610±645ng/m（3）），而对照点的PAH浓度（57.1±12.6ng/m（3））比其他点低1个数量级。城乡地区多环芳烃浓度相似的主要原因是生物质和生活煤炭燃烧的主要来源广泛分布在研究区域。 PAHs的分配常数(K-PM10)与相应的过冷液蒸气压值(p(L)(0))显着相关。然而，log K-PM10 与 log p(L)(0) 的回归斜率比 - 1 陡得多，表明吸附作用超过吸收作用。通过前向轨迹和聚类分析确定了研究区域的三种不同的流出模式。
The contamination and outflow of atmospheric polycyclic aromatic hydrocarbons (PAHs) in the Chinese Northern Plain, a region with a total area of 300 000 km(2) and a high PAH emission density, were investigated. Polyurethane foam (PUF) and PM10 samples were collected at 46 sites located in urban, rural (towns or villages), and control (remote mountain) areas in the winter from November 2005 to February 2006. The observed concentrations of atmospheric PAHs were generally higher than those reported for developed countries and southern Chinese cities. It was found that there was no significant difference in air PAH concentrations between the urban and the rural areas (514 +/- 563 ng/m(3) and 610 +/- 645 ng/ m(3), respectively), while the PAH concentrations at the control sites (57.1 +/- 12.6 ng/m(3)) were 1 order of magnitude lower than those at the other sites. The primary reason for the similarity in PAH concentrations between urban and rural areas was the fact that the predominant sources of biomass and domestic coal combustion were widely spread over the study area. The partition constants (K-PM10) of PAHs were significantly correlated to the corresponding values of subcooled liquid-vapor pressure (p(L)(0)). However, the regression slopes of log K-PM10 versus log p(L)(0) were much steeper than - 1, indicating adsorption dominated over absorption. Three distinct patterns of outflow from the study area were identified by forward trajectory and cluster analysis.