Tracing and quantifying contributions of end members to karst water at a coalfield in southwest China
Tracing and quantifying contributions of end members to karst water at a coalfield in southwest China
复制标题
追踪和量化中国西南煤田终端成员对岩溶水的贡献
DOI：
10.1016/j.chemosphere.2019.06.066
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Cao Xingxing
中科院分区：
文献类型：
--
作者：
Sun Jing;Takahashi Yoshio;Strosnider William H.J.;Kogure Toshihiro;Wu Pan;Cao Xingxing
岩溶水占世界饮用水的25%，特别容易受到人为污染。中国西南地区重要岩溶含水层的微量元素污染就是这种情况。约20%的总研究面积由废弃的尾矿与高浓度的铁，硫，锰，砷，铜，铬。来自尾矿黄铁矿氧化的酸性矿山排水（AMD）的特征是低pH值和高浓度的Fe，SO42−和As。泉水中Fe、Mn、Al、SO42−、As、Cd和Pb的浓度在雨季和旱季均高于WHO和USEPA饮用水指南。根据矿物特征、水文地球化学和同位素组成（δ34SSO4、δ18OSO4和δ18OH2O）的结果，AMD水的化学成分主要受黄铁矿氧化作用控制，河水受大气降水控制，泉水受碳酸盐岩溶解和与河水和AMD沃茨混合控制。三端元混合模型确定了这些不同端元对泉水水质的贡献。虽然AMD水的特点是最低的混合百分比在湿（14.1%）和干（26.9%）的季节，它发挥了非常重要的作用，在降低泉水水质。基于这些研究结果，调查策略照明季节性水质和潜在的修复方法，相应的污染物的泉水也提出了管理这个严重污染的岩溶系统。研究结果可能有利于世界其他地区这些特别复杂和脆弱的系统的补救规划。
Karst water, which provides 25% of the world's drinking water, is especially vulnerable to anthropogenic contamination. Such is the case in southwestern China with trace element pollution in important karst aquifers. Approximately 20% of the total study area consisted of abandoned mine tailings with elevated concentrations of Fe, S, Mn, As, Cu, and Cr. Acid mine drainage (AMD) water originating from pyrite oxidation of the tailings was characterized by low pH and high concentrations of Fe, SO42−, and As. Concentrations of Fe, Mn, Al, SO42−, As, Cd, and Pb in spring water in wet and dry seasons were greater than WHO and USEPA drinking water guidelines. Based on the results of mineral characterizations, hydrogeochemistry, and isotopic compositions (δ34SSO4, δ18OSO4, and δ18OH2O), the chemistry of AMD water was primarily controlled by pyrite oxidation, river water by atmospheric precipitation, and spring water by carbonate rock dissolution and mixing with river and AMD waters. A three-end-member mixing model identified the contributions of these different end members to spring water quality. Although AMD water was characterized by the lowest mixing percentages during the wet (14.1%) and dry (26.9%) seasons, it played a very important role in degrading spring water quality. Based on these findings, an investigation strategy was developed for illuminating seasonal water quality and potential remediation methods corresponding to the contaminants in the spring water are also proposed to manage this seriously polluted karst system. Results could benefit remediation planning for these distinctively complex and vulnerable systems in other regions of the world.