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The relationship between magnetic parameters and heavy metal contents of indoor dust in e-waste recycling impacted area, Southeast China

机译:东南电子垃圾回收影响区室内粉尘的磁参数与重金属含量的关系

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摘要

Environmental contamination due to uncontrolled e-waste recycling is an emerging global problem. The aim of this study is to test the applicability of magnetic methods for detecting the metal pollutants emitted from e-waste recycling activities. Dust samples collected from a typical e-waste recycling region in Guiyu, Guangdong Province, China, were investigated using magnetic, geochemical, micro-morphological and min-eralogical analysis. The values of mass-specific susceptibility (x) and saturation isothermal remanent magnetization (SIRM) in dusts from e-waste recycling impacted areas ranged from 101 to 636 × 10~(-8) m~3 kg~(-3) and from 10.5 to 85.2×10~(-3) Am~2 kg~(-1), respectively. There was a significant correlation between SIRM and % (r~2 = 0.747, p<0.001), indicating that ferrimagnetic minerals were dominating χ in the dust samples. The values of χ_(fd)% varied from 2.6 to 4.6% with a mean of 3.4%, which suggested that magnetic carriers in the dusts are predominately coarse-grained particles. Two shapes of magnetic particles, spherule (10-150 μm) and angular-shaped particles (30-300 μrn), were identified by scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX) analyses. κ-T curves, magnetic hysteresis loops and X-ray diffraction (XRD) analysis indicated that these magnetic particles were magnetite and goethite. There were significant correlations between SIRM and heavy metals (especially Cd, Co, Fe, Ni and Zn) as well as the Tomlinson pollution load index (PLI) of the dust, indicating that SIRM can be used as an efficient proxy for metal pollution in the e-waste recycling impacted area.
机译:电子废物回收不受控制造成的环境污染是一个新兴的全球性问题。这项研究的目的是测试磁性方法在检测电子废物回收活动中排放的金属污染物中的适用性。使用磁,地球化学,微观形态和最小能谱分析法对从中国广东省贵屿市一个典型的电子废物回收区收集的粉尘样品进行了调查。电子废物回收影响区域粉尘的比重磁化率(x)和饱和等温剩余磁化强度(SIRM)范围为101至636×10〜(-8)m〜3 kg〜(-3)和分别为10.5至85.2×10〜(-3)Am〜2 kg〜(-1)。 SIRM与%之间存在显着相关性(r〜2 = 0.747,p <0.001),表明粉尘样品中亚铁磁性矿物占χ。 χ_(fd)%的值在2.6%至4.6%之间变化,平均值为3.4%,这表明粉尘中的磁性载体主要是粗粒颗粒。通过扫描电子显微镜(SEM)和能量色散X射线能谱仪(EDX)分析确定了两种形状的磁性颗粒,分别为球形(10-150μm)和角形颗粒(30-300μrn)。 κ-T曲线,磁滞回线和X射线衍射(XRD)分析表明,这些磁性颗粒是磁铁矿和针铁矿。 SIRM与重金属(尤其是Cd,Co,Fe,Ni和Zn)以及粉尘的Tomlinson污染负荷指数(PLI)之间存在显着相关性,这表明SIRM可以用作重金属的有效替代品。电子废物回收受影响地区。

著录项

  • 来源
    《Science of the total environment》 |2012年第1期|p.302-308|共7页
  • 作者单位

    State Key Laboratory of Biogeology and Environmental Geology, China University of Ceosciences, Wuhan 430074, China,Faculty of Earth Science, China University of Ceosciences, Wuhan 430074, China;

    Institute of Geophysical and Ceochemical Exploration, Langfang 065000, China;

    State Key Laboratory of Biogeology and Environmental Geology, China University of Ceosciences, Wuhan 430074, China,Faculty of Earth Science, China University of Ceosciences, Wuhan 430074, China;

    Faculty of Earth Science, China University of Ceosciences, Wuhan 430074, China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    environmental magnetism; heavy metals; dust; E-waste recycling;

    机译:环境磁重金属;灰尘;电子废物回收;
  • 入库时间 2022-08-17 13:54:48

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