首页> 外文期刊>The Science of the Total Environment >Legacy of multiple heavy metal(loid)s contamination and ecological risks in farmland soils from a historical artisanal zinc smelting area
【24h】

Legacy of multiple heavy metal(loid)s contamination and ecological risks in farmland soils from a historical artisanal zinc smelting area

机译:历史悠久的手工锌冶炼区农田土壤中多种重金属(胶体)污染的遗产和生态风险

获取原文
获取原文并翻译 | 示例
       

摘要

Farmland soil contamination of heavy metal(loid)s (HM) derived from smelting activities is a global concern, owing to its potential threat for human health through food chain. This study aims to evaluate total contents and bioavail-ability of HMs (Pb, Zn. Tl, Cd, Cu, As. Ag, Co, Cr and Ni) in farmland soils distributed over ten different villages from a former artisanal zinc smelting area in the northwest Guizhou province, China. The results showed that most of the studied soils still exhibited exceptionally high enrichment of Pb, Zn, Cd and As. High levels of bioavailable HMs were also observed in some samples, which may enter the human food chain through agricultural activities. Further analyses by Scanning Transmission Electron Microscopy - Energy Dispersive Spectroscopy (STEM-EDS), X-ray photo-electron spectroscopy (XPS) and X-ray diffraction (XRD) showed the presence of Zn smelting by-products such as Fe oxides, ZnO and PbSO_4 even in nanoscale particles retained by the soils. Elemental mapping by EDS confirmed a close association of the studied HMs with the smelting waste particles. All these results signify that high levels of HM-contamination from historical artisanal zinc smelting activities still persist and threaten the health of local residents, despite the fact that the major industrial-derived-contamination period ended >15 years ago. Our findings highlight pivotal concerns in similar artisanal-smelting-affected farmland soils of suspected contamination, due to less-expected toxic elements such as Tl, which may cause high ecological health risks.
机译:冶炼活动对农田土壤重金属(HM)的污染是全球关注的问题,因为它通过食物链对人类健康构成潜在威胁。这项研究旨在评估分布在10个不同村庄的农田土壤中HMs(Pb,Zn,Tl,Cd,Cu,As,Ag,Co,Cr和Ni)的总含量和生物利用度,该村庄来自以前的手工锌冶炼区。中国西北贵州省。结果表明,大多数研究过的土壤仍表现出异常高的Pb,Zn,Cd和As富集度。在某些样品中还观察到了高水平的可生物利用的HMs,它们可能通过农业活动进入人类食物链。通过扫描透射电子显微镜-能量色散光谱仪(STEM-EDS),X射线光电子光谱仪(XPS)和X射线衍射仪(XRD)进行的进一步分析表明,存在锌冶炼副产物,例如氧化铁,氧化锌甚至在土壤中保留的纳米级颗粒中也含有PbSO_4。 EDS的元素图谱确定了所研究的HM与冶炼废料颗粒之间的紧密联系。所有这些结果表明,尽管主要的工业污染期已结束于15年前,但历史上的手工锌冶炼活动对HM的污染仍持续存在,并威胁着当地居民的健康。我们的发现凸显了在类似的受手工冶炼影响的农田土壤中受到怀疑的污染问题,这是由于预期的有毒元素(例如Tl)较少,这可能会带来很高的生态健康风险。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号