铁矿周边地下水金属元素分布及健康风险评价

以崇左市红阳村、两岸村、亭乐村和孔甲村所在地为研究区域，对该区域内某铁矿周边30个地下水样品中12种金属元素（Hg、Mn、Fe、Al、Zn、Ni、As、Pb、Cr、Cd、Co、Cu）进行测定和分析，运用多元统计的方法和健康风险评价模型研究了地下水金属元素的分布特征及其引起的健康风险.结果表明，地下水中Zn和Fe平均浓度（250.32，103.96μg/L）较高，Hg、Mn、Fe、Al和Zn超过了《地下水质量标准》（GB/T 14848-2017）规定的Ⅲ类标准限值.Fe、Mn、Al高浓度主要分布在红阳村和亭乐村，Zn、Hg高浓度主要分布在红阳村和两岸村.多元统计分析表明，Fe、Mn、Al、Pb、As、Co元素主要来源于铁矿开采，Cu、Zn、Cr、Ni元素主要与铅锌矿的开采与区域地质背景有关，Hg主要来源于本底值及糖厂和造纸厂等企业污染，Cd主要来源于自然源.健康风险评价表明，两岸村地下水金属元素引起的健康总风险（8.82×10^-5a^-1）最高，儿童健康总风险大于成人，经饮水途径引起的健康风险比皮肤接触途径高2~3个数量级，Cr的致癌风险接近或高于最大可接受风险水平5.0×10^-5a^-1，非致癌风险水平在10^-14~10^-9a^-1，低于最大可接受风险水平4~9个数量级.

Distribution and health risk assessment of metals in groundwater around iron mine

Concentration of twelve metals, Hg, Mn, Fe, Al, Zn, Ni, As, Pb, Cr, Cd, Co and Cu from thirty samples collected from groundwater around iron mine in Hongyang, Liangan, Tingle and Kongjia villages in Chongzuo city were measured and analyzed to investigate their distribution characteristics and the human health risks. The distribution characteristics of these elements were analyzed using multivariate statistical analysis method and the health risks caused by metals were assessed using human health risk assessment model. The average concentrations of Zn and Fe ((250.32, 103.96μg/L) were higher than others. Concentrations of Hg, Mn, Fe, Al and Zn exceeded the Quality Standards for Groundwater (GB/T 14848-2017). The highest concentrations of Fe, Mn and Al were mainly located in Hongyang and Tingle, the highest concentrations of Zn and Hg were mainly located in Hongyang and Liangan. Multivariate statistical analysis indicated that Fe, Mn, Al, Pb, As and Co mainly originated from iron mining, while Cu, Zn, Cr and Ni were mainly related to the lead-zinc mine and regional geological background. Hg mainly originated from contaminated sugar and paper mills' contamination and Cd mainly originated from natural sources. The results of health risk assessment indicated that the total risks of metals in Liangan is the highest, which were 8.82×10^-5a^-1.Children had greater health risks than adults. The health risks of metals through drinking pathway were 2~3 orders of magnitude higher than the values caused by dermal contact pathway. Carcinogenic risks caused by Cr were higher than the maximum allowance levels (5.0×10^-5a^-1). The non-carcinogenic risk levels of the metals were 10^-14~10^-9a^-1, which were 4~9 orders of magnitude lower than the maximum allowance.