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Heavy metal(loid) pollution of a hard-rock aquifer: evidence, distribution, and source
Environmental Science and Pollution Research ( IF 5.8 ) Pub Date : 2021-03-03 , DOI: 10.1007/s11356-021-13079-2
Mojtaba Adeli 1 , Zargham Mohammadi 1 , Behnam Keshavarzi 1 , Keyvan Amjadian 2, 3 , Masoud Kafi 4
Affiliation  

Composition of groundwater in the mining areas can be affected by oxidation of sulfide minerals and related reactions. Given that in the Miduk copper mine area, groundwater is the only available water resource for drinking and agriculture purposes. In the study area, assessment and measurement of groundwater physicochemical properties such as pH, TDS, EC, major cations, and major anions were performed. Physicochemical studies showed that the calcium and sulfate are the main cations and anions (Ca-SO4 water type), respectively. Groundwater in the area is mainly fresh and with a source of meteoric water infiltration. Three pollution indices, HEI, HPI, and Cd, were selected to evaluate the concentration level of ten of heavy metal(loid)s (Al, As, Cd, Cu, Fe, Mn, Mo, Ni, Pb, and Zn). To investigate the source and relations between heavy metal(loid)s, multivariate statistical analysis was executed for eleven variables. The results of pollution indices showed that samples in group 1 (mine pit area) have the highest level of pollution and considering that the samples of this group are in the closest distance to the mine pit and group 3 (springs) around the study area had the least level of pollution. Multivariate statistical analysis showed a negative correlation between heavy metal(loid)s (with the exception of arsenic and molybdenum) with the distance from the mine pit. This suggested the origin of these elements can be considered as anthropogenic source due to mining activities. The geogenic source of arsenic, molybdenum, and lead can be cited based on Spearman’s correlation coefficient supported by PCA analysis.



中文翻译:

硬岩含水层的重金属(类)污染:证据,分布和来源

硫化矿物质的氧化和相关反应会影响矿区地下水的组成。鉴于米杜克(Miduk)铜矿区,地下水是唯一可用于饮用和农业目的的水资源。在研究区域,对地下水的物理化学特性(例如pH值,TDS,EC,主要阳离子和主要阴离子)进行了评估和测量。理化研究表明,钙和硫酸盐分别是主要的阳离子和阴离子(Ca-SO 4水类型)。该地区的地下水主要是新鲜的,并且有大量的水渗透。三种污染指数:HEI,HPI和C d选择,以评估十种重金属(铝,砷,镉,铜,铁,锰,钼,镍,铅和锌)的浓度水平。为了调查重金属(胶体)的来源和关系,对11个变量进行了多元统计分析。污染指数的结果表明,第1组(矿井区)的污染水平最高,考虑到该组样品与矿井的距离最近,研究区域周围的第3组(泉水)的污染水平最高。污染程度最低。多变量统计分析表明,重金属(除砷和钼外)与矿坑的距离呈负相关。这表明由于采矿活动,这些元素的起源可被认为是人为来源。

更新日期:2021-03-03
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