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Physicochemical properties and toxic elements in bus stop dusts from Qingyang NW China

机译:中国西北地区庆阳市公交车站扬尘中的理化特性和有毒元素

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摘要

To appraise the content and pollution level of cadmium (Cd), arsenic (As), mercury (Hg), nickel (Ni) and lead (Pb) in bus stop dusts, representative samples (n = 53) were collected from the city of Qingyang in Gansu province, NW China. The Cd, As, Hg, Ni, and Pb contents and physicochemical properties (particle size, organic matter, pH and magnetic properties) of the bus stop dusts were investigated. Pollution levels were evaluated by the Nemero synthesis pollution index (NSPI) and geoaccumulation index (Igeo). The results indicate that the magnetic susceptibilities of the bus stop dusts were higher than those in the local soils. Cd, As, Ni, and Pb contents ranged from 0.4 to 3.1, 7.1 to 16.3, 12.7 to 151.3, and 20.1 to 96.2 mg kg−1, with average values of 1.2, 10.1, 22.2, and 44.9 mg kg−1, while Hg content ranged from 4.5 to 1357.7 µg kg−1 with an average of 214.0 µg kg−1. The mean contents of Cd, As, Hg, Ni, and Pb were 12.0, 0.8, 10.0, 0.6, and 2.4 times the local soil background value, respectively. Cd, Hg and Pb in approximately 96%, 62% and 19% of the bus stop dusts were above the “moderately polluted” level in terms of Igeo. As and Ni were defined as “practically unpolluted” in all of the bus stop dusts. The NSPI values of all of the bus stop dust samples exceeded 3, which reveals overall serious contamination of harmful elements.
机译:为了评估公交车站粉尘中镉,砷,砷,汞,镍和铅的含量和污染水平,从该市收集了代表性样品(n = 53)。中国西北地区甘肃省庆阳市。研究了公共汽车站粉尘中Cd,As,Hg,Ni和Pb的含量以及理化性质(粒径,有机物,pH和磁性)。通过Nemero综合污染指数(NSPI)和地质累积指数(Igeo)评估污染水平。结果表明,公交车站粉尘的磁化率高于当地土壤的磁化率。 Cd,As,Ni和Pb的含量范围为0.4至3.1、7.1至16.3、12.7至151.3和20.1至96.2 mg kg -1 ,平均值分别为1.2、10.1、22.2和Hg含量为44.9 mg kg -1 ,而Hg含量为4.5至1357.7 ggkgkg -1 ,平均为214.0 µg kg -1 。 Cd,As,Hg,Ni和Pb的平均含量分别为当地土壤本底值的12.0、0.8、10.0、0.6和2.4倍。就Igeo而言,约96%,62%和19%的公交车站灰尘中的Cd,Hg和Pb高于“中度污染”水平。在所有公交车站的灰尘中,As和Ni被定义为“几乎没有污染”。所有公交车站灰尘样品的NSPI值均超过3,这表明有害元素总体上受到严重污染。

著录项

  • 期刊名称 Scientific Reports
  • 作者

    Yongfu Wu; Xinwei Lu;

  • 作者单位
  • 年(卷),期 -1(8),-1
  • 年度 -1
  • 页码 12568
  • 总页数 9
  • 原文格式 PDF
  • 正文语种
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