Mehrabi Behzad, Mehrabani Shiva, Rafiei Behrouz, Yaghoubi Behrouz
Facuty of Earth Sciences, Geochemistry Department, Kharazmi University, 15614, Tehran, Iran.
Department of Geology, Faculty of Science, Bu Ali Sina University, 65178-38695, Hamedan, Iran.
Environ Monit Assess. 2015 Dec;187(12):727. doi: 10.1007/s10661-015-4864-0. Epub 2015 Nov 6.
In this study, 28 groundwater and 13 soil samples from Ahangaran mining district in Hamedan Province, west of Iran were collected to evaluate the level of contamination. Average concentrations of As, Cu, Pb, Zn, Mn, Sb, and Ni in groundwater samples were 1.39, 3.73, 2.18, 9.37, 2.35, 4.44, and 5.50 μg/L (wet season), and 11.64, 4.92, 4.32, 14.77, 5.43, 4.12, and 0.98 μg/L (dry season), respectively. Results of groundwater samples analysis showed that the average of analyzed metals in the wet and dry seasons were below the permissible limits, except As in the dry season which displays concentrations that exceed US EPA water quality criteria recommended for drinking water. Also, the heavy metal pollution index (HPI) values in each sampling station were less than the critical index limit and were suitable for drinking. Factor analysis revealed that variables influential to groundwater quality in one season may not be as important in another season. Average concentrations of Ag, As, Cd, Cu, Pb, Sb, and Zn in soil samples were 2.61, 31.44, 0.51, 55.90, 1284.9, 21.26, and 156.04 mg kg(-1), respectively. The results of the geoaccumulation index (I geo) showed the following decreasing order: Pb > Zn > Cu > As > Sb > Cd > Ag. Potential ecological risk index (RI) suggests that the contamination in the investigated area is moderate to very high risk and the ranking of the contaminants in decreasing order is Ag > Sb > Pb > Cd > As > Cu > Zn.
在本研究中，采集了伊朗西部哈马丹省阿汉加兰矿区的28份地下水样本和13份土壤样本，以评估污染水平。地下水样本中砷、铜、铅、锌、锰、锑和镍的平均浓度在湿季分别为1.39、3.73、2.18、9.37、2.35、4.44和5.50μg/L，在干季分别为11.64、4.92、4.32、14.77、5.43、4.12和0.98μg/L。地下水样本分析结果表明，除干季砷浓度超过美国环境保护局推荐的饮用水水质标准外，湿季和干季分析的金属平均含量均低于允许限值。此外，各采样站的重金属污染指数（HPI）值均小于临界指数限值，适合饮用。因子分析表明，影响一个季节地下水质量的变量在另一个季节可能不那么重要。土壤样本中银、砷、镉、铜、铅、锑和锌的平均浓度分别为2.61、31.44、0.51、55.90、1284.9、21.26和156.04mg/kg。地累积指数（I geo）结果显示以下递减顺序：铅＞锌＞铜＞砷＞锑＞镉＞银。潜在生态风险指数（RI）表明，研究区域的污染为中度至高风险，污染物的排名递减顺序为银＞锑＞铅＞镉＞砷＞铜＞锌。
