Hazardous metals emissions from e-waste-processing sites in a village in northern Vietnam
Hazardous metals emissions from e-waste-processing sites in a village in northern Vietnam
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DOI：
10.1016/j.emcon.2018.10.001
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发表时间：
2018
影响因子：
6
通讯作者：
N. Uchida;H. Matsukami;Masayuki Someya;N. M. Tue;Le Huu Tuyen;P. Viet;Shin Takahashi;S. Tanabe;G. Suzuki
中科院分区：
文献类型：
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作者：
N. Uchida;H. Matsukami;Masayuki Someya;N. M. Tue;Le Huu Tuyen;P. Viet;Shin Takahashi;S. Tanabe;G. Suzuki
自2000年初以来，不适当的电子废物处理操作是发展中国家的一个严重问题。2012年至2014年，在越南北方一个村庄的电子废物处理场进行了实地研究，以阐明其影响和环境中的有毒物质扩散。我们调查了从电子垃圾处理场，露天焚烧场和稻田现场收集的表层土壤样品。还从流经村庄的一条河流中收集了沉积物样本和水样。土壤和河流沉积物样品中的有害金属浓度表明，7种元素（Ca，Cu，Mo，Ni，Pb，Sn和Zn）由于电子废物处理而具有高浓度。最值得注意的是，Pb和Cu在土壤样品中的浓度很高（Pb：26-2200 mg/kg，Cu：22-3000 mg/kg）。多变量分析结果表明，这7个元素与电子废物处理密切相关。在为期三年的研究期间，在电子废物处理发生的地方，有害金属的浓度呈上升趋势，尽管目前在统计上并不显著。露天焚烧活动对Cu的累积影响较大，露天焚烧土壤样品中Cu的最大浓度从2012年的340 mg/kg增加到2014年的3000 mg/kg。主要的危险金属因电子废物加工车间的类型不同而有很大差异，因为危险金属的构成受到电子废物类型和加工程序的影响。有必要避免在露天环境中处理电子废物，以控制有害物质的排放。尤其是禁止露天焚烧。
Inappropriate e-waste-processing operation is a serious issue in developing countries since the early 2000's. Field research was conducted to clarify its influences and diffuse toxic substances in the environment at e-waste-processing sites in a village in northern Vietnam from 2012 to 2014. We investigated surface soil samples collected from e-waste-processing sites, open burning sites, and rice paddy sites. Sediment samples and water samples were also collected from a river that runs through the village. The hazardous metal concentration in soil and river sediment samples indicated that 7 elements (Ca, Cu, Mo, Ni, Pb, Sn, and Zn) had high concentrations as a result of e-waste-processing. Most notably, Pb and Cu had high concentrations in soil samples (Pb: 26–2200 mg/kg, Cu: 22–3000 mg/kg). The results of a multivariate analysis indicated that these 7 elements were closely correlated with e-waste-processing. Concentrations of hazardous metals showed an upward trend where e-waste-processing occurred during the 3-year study period, although it was not significant statistically at present. Open burning activity had a great influence on Cu accumulation, and maximum Cu concentrations increased from 340 mg/kg in 2012–3000 mg/kg in 2014 in soil samples from open-burning sites. There were large differences in the dominant hazardous metal depending on the type of e-waste-processing workshop because hazardous metal composition was influenced by the types of e-waste and the processing procedures. It is necessary to avoid e-waste processing in open-air environment to control emissions of hazardous substances. Especially, open burning should be prohibited.