摘要
The key objective of this research was to estimate the Ni and Cr contents of soil around the Baghjar Chromite Mine（BCM）of Sabzevar Ophiolite Belt,Northeastern Iran,and assess the degree of soil pollution using the pollution indices.Soil samples（0-20 cm depth） were collected at various distances from the BCM.In the present research,heavy metals（Cr and Ni） in soil samples were analyzed by atomic absorption spectrometry to detect their concentrations and contour maps were produced to explain the metal spatial distribution.Also,the degree of metal pollution was quantified.The results indicate that the soils in the studied area are contaminated by Cr and Ni.The corresponding concentrations for Cr and Ni are（156.19±24.45） and（321.7±133.27） mg/kg,respectively,which exceed the corresponding maximum allowable concentrations in soils.The different indices demonstrate that soils around chromite mine are significantly contaminated with Cr and Ni,suggesting several times higher levels of toxic metals than normal ranges.The above results revealed that the heavy metal concentrations increase with increasing the distance from the mine and mining pollutants can be transported to long distances from their sources.
主要分析伊朗东北部萨卜泽瓦尔蛇绿岩带Baghejar铬铁矿（BCM）周边土壤的镍、铬浓度,采用污染指数评估土壤污染程度。土壤样品（深度为0-20cm）采于距BCM矿不同距离的地点。采用原子吸收光谱测定土壤样品中重金属（铬和镍）含量。绘制等高线图描述重金属的空间分布,同时对金属污染程度进行了量化。结果表明,采样地土壤受到铬和镍污染。铬和镍的相应浓度分别达到（156.19±24.45）和（321.7±133.27）mg/kg,超出对应的土壤最大允许浓度。各种指数显示出铬铁矿周边土壤显著受到铬和镍污染,超出正常范围数倍之多。研究表明,重金属浓度随着与矿区距离增加而增加。采矿产生的污染可以迁移到距源头较远的地方。
基金
partially supported by Malayer University,Iran
