Spatial distribution of chromium in soils contaminated by chromium-containing slag
Spatial distribution of chromium in soils contaminated by chromium-containing slag
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DOI：
10.1016/s1003-6326(08)60346-5
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发表时间：
2009-06-01
影响因子：
4.5
通讯作者：
Su Chang-qing
中科院分区：
文献类型：
--
作者：
Huang Shun-hong;Peng Bing;Su Chang-qing
为评价某铬铁合金厂铬渣场土壤中金属铬（Cr）的污染状况，选取湖南省某铁合金厂渣场下、渣场附近、排污渠出口附近的耕地土壤和5 km外的未污染场地作为研究对象。测定了土壤全铬和水溶性铬的含量。结果表明，渣堆附近土壤全铬含量最高，其次是渣堆下和厂区排污渠出口附近。3个污染点表层土壤中总铬含量超过国家土壤二级环境质量标准的3.5、5.4和1.8倍。在大多数铬污染土壤中，全铬在40-60 cm土层中有相对积累，而在未污染土壤中则没有这种趋势。渣堆下表层土壤和渣堆附近土壤水溶性Cr（VI）平均浓度分别是未污染土壤的176.9倍和52.7倍。而污水沟附近土壤中水溶性Cr（14）含量均较低，与未污染土壤中的含量接近。土壤剖面中水溶性Cr（VI）含量随土层深度的增加而降低，但矿渣堆下土壤中水溶性Cr（VI）含量在100-150 cm深度仍保持较高水平。研究结果表明，Cr（VI）的迁移对该地区地下水系统具有潜在的危害。
To evaluate the metal chromium (Cr) contamination of soil at a chromium-containing slag site by ferrochromium production, the contaminated sites, under slag heap, in the vicinity of slag heap and arable soils near the outlet of sewer channel, and unpolluted site 5 kin away from one ferroalloy plant in Hunan Province, China, were selected. The concentrations of total Cr and water soluble Cr in bulk soil samples and profile depth samples were determined. The results show that the soils in the vicinity of slag heap have the highest total Cr content followed by the soils under the slag heap and near the outlet of sewer channel of the factory. The mean concentrations of total Cr in the top soils at above three contaminated locations exceed the critical level of Secondary Environmental Quality Standard for Soil in China by 3.5, 5.4 and 1.8 times. In most Cr polluted soils, total Cr has a relative accumulation in soil depth of 40-60 cm, but this trend is not found in unpolluted soils. The average concentrations of water soluble Cr (VI) in top soils under slag heap and in the vicinity of slag heap are 176.9 times and 52.7 times higher than that in the uncontaminated soils, respectively. However, water soluble Cr (14) contents in soils near sewer channel are all low and the values are close to that in the uncontaminated soils. Although water Soluble Cr (VI) content in soil profiles decreases with soil depths, it in soils under slag heap maintains a high level even at a depth of 100-150 cm. The results imply that the transportation of Cr (VI) can result in a potential risk of groundwater system in this area.