Magnetic response to air pollution recorded by soil and dust-loaded leaves in a changing industrial environment
Magnetic response to air pollution recorded by soil and dust-loaded leaves in a changing industrial environment
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在不断变化的工业环境中土壤和含尘树叶记录的对空气污染的磁响应
DOI：
10.1016/j.atmosenv.2015.06.017
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发表时间：
2015-10-01
影响因子：
5
通讯作者：
Roesler, Wolfgang
中科院分区：
文献类型：
--
作者：
Cao, Liwan;Appel, Erwin;Roesler, Wolfgang
吕宋市是世界上污染最严重的城市之一，由于不受控制的工业活动，煤炭燃烧释放大量的重金属（HMs）和多环芳烃（PAHs）到大气中。我们使用土壤和树叶作为大气颗粒物的受体，以测试磁性方法评估和区分过去和现在的污染的效率。结果表明，表层土壤和叶片样品中的强磁性颗粒主要为低磁性磁铁矿，其粒度分布范围比背景土壤中的大，有利于区分人为和自然来源。表层土壤磁信号反映了过去几十年积累的污染物。原状和扰动（耕作）土壤剖面之间的磁性垂直分布的差异表明，耕作深度是污染物在耕作土壤中迁移的最重要的因素。叶片样品的磁化率值反映了污染的现状，甚至可以追踪季节变化。MS的空间地图确定了过去和现在的环境条件所造成的工业场所在过去十年内关闭的差异。重金属含量（Fe、Cr、Ni、Cu、Pb）与MS值之间的相关系数在叶片样品中为显著正相关，在表土样品中仍为中等相关。我们的研究结果表明，实用和经济价值的磁技术的污染评价，也为研究的情况下，一个复杂的污染历史，一个相对较高的磁背景和干扰的土地利用。(C)2015爱思唯尔有限公司版权所有。
Linfen city is one of the World's most polluted cities due to uncontrolled industrial activities of coal combustion releasing huge amounts of heavy metals (HMs) and polycyclic aromatic hydrocarbons (PAHs) into the atmosphere. We used soil and leaves as receptors for atmospheric particulate matter to test the efficiency of magnetic approach for assessing and discriminating past and present pollution. The results indicate that strong magnetic particles in topsoil and leaf samples are mainly low-coercivity magnetite, occurring in a larger grain-size range than in background soil, which is helpful to separate anthropogenic and natural sources. Topsoil magnetic signals reflect pollutants, which accumulated over the last decades. Differences in the vertical distribution of magnetic properties between undisturbed and disturbed (cultivated) soil profiles show that the plowing depth is the most important factor for migration of pollutants in cultivated soils. Magnetic susceptibility (MS) values of leaf samples reflect the present state of pollution and can even trace seasonal changes. Spatial maps of MS identify differences of the past and present environmental conditions caused by the shutdown of industrial sites within the last decade. Correlation coefficients between analyzed HM contents (Fe, Cr, Ni, Cu, Pb) and MS values are significantly positive in leaf samples, and still moderate in topsoil samples. Our results demonstrate the practical and economical value of magnetic techniques for pollution assessment, also for the studied case with a complex pollution history, a relatively high magnetic background and disturbing land use. (C) 2015 Elsevier Ltd. All rights reserved.