Long-range atmospheric transport and the distribution of polycyclic aromatic hydrocarbons in Changbai Mountain.
Long-range atmospheric transport and the distribution of polycyclic aromatic hydrocarbons in Changbai Mountain.
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DOI：
10.1016/j.chemosphere.2014.06.005
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发表时间：
2015
期刊：
影响因子：
8.8
通讯作者：
Xiangai Zhao;Seung-Kyu Kim;Weihong Zhu;N. Kannan;Donghao Li
中科院分区：
文献类型：
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作者：
Xiangai Zhao;Seung-Kyu Kim;Weihong Zhu;N. Kannan;Donghao Li
长白山（也被称为“Baekdu”）位于中朝边境，是中国东北部最高的山峰（2750米）。最近，这一山区的空气污染急剧增加，这不仅是因为旅游业带来的交通量不断增加，而且还因为受污染的西风经过中国东部地区的主要工业和城市进行远距离输送。为了评估这两种污染源的相对重要性，测定了16种多环芳烃（PAHs）作为模式物质在山区土壤中的含量。2009年7月至8月期间，从不同纬度的山的不同侧面共采集了32个土壤样品。北方的∑PAH浓度范围为38.5-190.1 ng g− 1，南方为117.7-443.6 ng g− 1，西部为75.3-437.3 ng g− 1。在面临西风且降水丰富的南部和西部，∑PAHs水平随着纬度的增加而逐渐增加。然而，在降雨较少且处于风的背风方向的北方一侧没有观察到类似的浓度梯度。南侧和西侧土壤中多环芳烃以高分子量为主，北方土壤中多环芳烃以低分子量为主。这些结果表明，大气中的长距离传输和冷捕集强烈影响了多环芳烃在山地土壤中的分布。
The Changbai (also known as “Baekdu”) Mountain, on the border between China and North Korea, is the highest mountain (2750 m) in northeastern China. Recently, this mountain region has experienced a dramatic increase in air pollution, not only because of increasing volumes of tourism-derived traffic but also because of the long-range transport of polluted westerly winds passing through major industrial and urban cities in the eastern region of China. To assess the relative importance of the two sources of pollution, 16 polycyclic aromatic hydrocarbons (PAHs) as model substances were determined in the mountain soil. A total of 32 soil samples were collected from different sides of the mountain at different latitudes between July and August of 2009. The ∑PAH concentrations were within the range 38.5–190.1 ng g−1on the northern side, 117.7–443.6 ng g−1on the southern side, and 75.3–437.3 ng g−1on the western side. A progressive increase in the level of ∑PAHs with latitude was observed on the southern and western sides that face the westerly wind with abundant precipitation. However, a similar concentration gradient was not observed on the northern side that receives less rain and is on the leeward direction of the wind. The high-molecular-weight PAH compounds were predominant in the soils on the southern and western sides, while low-molecular-weight PAHs dominated the northern side soils. These findings show that the distribution of PAHs in the mountain soil is strongly influenced by the atmospheric long-range transport and cold trapping.