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Atmos Environ:研究评估京蒙冀大气降尘重金属污染程度

来源:中国科学报 2013-11-20 11:24

日前,中科院新疆生态与地理所副研究员乔庆庆等人利用基于系统的环境磁学理论方法,结合地球化学及统计学分析手段,对内蒙古、河北及北京地区周边大气降尘进行了系统研究。对重金属元素与磁学参数的综合分析表明,污染来源的重金属元素主要包括铜、锌、铅等,而且这些重金属元素的污染负荷指数与表征磁性矿物含量的磁化率显著相关。研究人员基于此建立了磁学参数与重金属污染评价指数之间的定量化关系。相关研究发表在《大气环境》上。

专家认为,掌握大气降尘的污染特征和变化规律,可以有针对性地对环境进行有效管理,减轻降尘对空气污染的贡献,改善环境质量。因此,选择快速、有效的监测方法,是研究和解决城市大气降尘问题的关键。

该研究还显示,内蒙古地区较河北和北京地区污染程度低,随着人类活动密集程度的增加,污染程度将进一步加深。(生物谷Bioon.com)

生物谷推荐的英文摘要

Atmospheric Environment         doi.org/10.1016/j.atmosenv.2013.03.039

Assessment of heavy metal contamination of dustfall in northern China from integrated chemical and magnetic investigation

Qingqing Qiaoa, b,Baochun Huangb, c,Chunxia Zhangb, dJohn D.A.Pipere, Yuepeng Panf, Ying Sung

Magnetic phases are a common component of dustfall samples and mineral magnetic studies have been increasingly exploited for air quality studies in recent years to assess the source and spatial-temporal distribution of anthropogenic magnetic particulates and associated heavy metals. Here we report a comparative study of magnetic and chemical properties of atmospheric particulate deposits from rural areas of Inner Mongolia and urban regions of Hebei and Beijing. The sample sets were collected at 13 monitoring stations by the gravimetric method between April 2009 and March 2010. At the rural sites paramagnetic clays, complemented by hematite and goethite recognized by Isothermal Remanent Magnetism (IRM) and Diffuse Reflectance Spectra (DRS) investigations, accompany fine grained magnetite as an important fraction. Although present as a residual phase in samples from the urban regions, coarse-grained magnetite of anthropogenic origin dominants the magnetic signatures in these latter environments. Systematic variations with local anthropogenic activity including traffic, the mining of ores and a range of industrial emissions are identified, together with a seasonal signature in the Beijing area. We use correlations between magnetic concentration-related parameters, notably magnetic susceptibility, and the Pollution Load Index to demonstrate how magnetic parameters can be used as a practical tool for mapping degrees of heavy metal pollution and tracing the sources of pollutants in dustfall samples.

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