Assessing anthropogenic sources of mercury in soil in Wanshan Hg mining area, Guizhou, China
Assessing anthropogenic sources of mercury in soil in Wanshan Hg mining area, Guizhou, China
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DOI：
10.1007/s11356-013-1616-y
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发表时间：
2013-11-01
影响因子：
5.8
通讯作者：
Qiu, Guangle
中科院分区：
文献类型：
--
作者：
Dai, Zhihui;Feng, Xinbin;Qiu, Guangle
万山汞矿区长期的采矿和冶炼活动给土壤带来了一系列环境问题。关于当地土壤中汞的浓度，已经发表了几项研究，但本文所介绍的人类活动引起的土壤中汞的质量的全面评估，以前没有进行过。WMMA的三个地区被选为研究区域。本文在总结前人研究成果的基础上，选取了14个典型土壤剖面，分析了研究区土壤中汞的空间和垂直分布特征。区域地质背景、直接和间接汞沉降以及受汞污染的灌溉水是当地土壤汞污染的主要来源。此外，富集因子（EF）的方法被用来评估人为输入的汞到土壤中的程度。选择钛（Ti）作为参考元素来计算EF。一般来说，EF值的升高观察到在上层和接近矿山废物。据估计，土壤中人为来源的汞总量在耕地土壤中为1，227吨，在自然土壤中为75吨。研究结果表明，耕地土壤是研究区人为汞的主要汇。
Long-term mining and smelting activities brought a series of environmental issues into soils in Wanshan mercury (Hg) mining area (WMMA), Guizhou, China. Several studies have been published on the concentrations of Hg in local soils, but a comprehensive assessment of the mass of Hg in soil induced by anthropogenic activities, as presented in this paper, has not been previously conducted. Three districts of WMMA were chosen as the study areas. We summarized previous published data and sampled 14 typical soil profiles to analyze the spatial and vertical distributions of Hg in soil in the study areas. The regional geologic background, direct and indirect Hg deposition, and Hg-polluted irrigation water were considered as the main sources of Hg contaminations in local soils. Furthermore, the enrichment factor (EF) method was applied to assess the extent of anthropogenic input of Hg to soil. Titanium (Ti) was chosen to be the reference element to calculate the EF. Generally, the elevated values of EF were observed in the upper soil layers and close to mine wastes. The total budget of Hg in soil contributed from anthropogenic sources was estimated to be 1,227 t in arable soil and 75 t in natural soil. Our data showed that arable soil was the major sink of anthropogenic Hg in the study area.