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首页> 外文期刊>Journal of Hydrology >Arsenic content in groundwater from the southern part of the San Antonio-El Triunfo mining district, Baja California Sur, Mexico
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Arsenic content in groundwater from the southern part of the San Antonio-El Triunfo mining district, Baja California Sur, Mexico

机译：墨西哥下加利福尼亚州圣安东尼奥-埃尔·Triunfo矿区南部的地下水中的砷含量

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摘要

The San Antonio-El Triunfo mining district is located in a mountain region 60 km southeast of La Paz, the capital of the Mexican state of Baja California Sur. Mining activities, focused on gold and silver extraction, which began in the second half of the 18th century; the main activity took place between 1878 and 1911. The minerals were treated through the cyanide method, burned, and smelted. In effect between 800,000 and 1 million tons of mine waste materials were scattered in an area of approximately 350-400 km~2. This area contains today several byproducts as a result from arsenopyrite oxidation, such as arsenolite (As_2O_3). The aim of this study was to analyze groundwater composition in order to define the actual concentrations of relevant parameters to detect ore mining contaminations, especially in respect to arsenic. In the autumn of 2010, 29 groundwater samples were obtained using flow-through bailer or down-hole pump methods, and a total of 37 variables were measured in each sample. Arsenic (dissolved) exceeded the values established by the World Health Organization (WHO, 2011) (0.01 mg/L) in 41% of the monitored sites. The maximum concentration of arsenic found in one observation well was 0.45 mg/L. Four water samples, which were characterized by elevated concentration of boron (max. conc. 9.5 mg/ L), fluoride (max. conc. 3.25 mg/L) and alkaline pH values (>9), showed a composition typical for hydrothermal water. Because all four samples had arsenic concentration under 0.008 mg/L, we conclude that no significant impact of arsenic from hydrothermal fluids is found in the study area. Keywords: Gold mining; San Antonio-El Triunfo; Arsenic; Boron; Submarine vents; Geothermal fluids
机译：San Antonio-El Triunfo矿区位于墨西哥巴哈加州苏尔州首府拉巴斯东南60公里的山区。始于18世纪下半叶的采矿活动集中于金和银的提取;主要活动发生在1878年至1911年之间。矿物通过氰化物方法处理，燃烧和冶炼。实际上，大约有350-400 km〜2的区域散布了80万吨至100万吨的矿山废料。今天，该区域包含因毒砂氧化而产生的几种副产物，例如毒砂（As_2O_3）。这项研究的目的是分析地下水成分，以便确定相关参数的实际浓度，以检测矿石开采污染物，特别是砷。在2010年秋天，使用流通式拜勒法或井下泵法获得了29个地下水样品，每个样品中总共测量了37个变量。在41％的监测场所中，砷（溶解的）超过了世界卫生组织（WHO，2011）确定的值（0.01 mg / L）。在一个观察井中发现的最高砷浓度为0.45 mg / L。四个水样品的特征在于硼（典型浓度为9.5 mg / L），氟化物（最大浓度为3.25 mg / L）和碱性pH值（> 9）升高，其成分为热热水。由于所有四个样品的砷浓度都在0.008 mg / L以下，因此我们得出结论，在研究区域内未发现热液中砷的显着影响。关键词：金矿开采圣安东尼奥-El Triunfo;砷;硼;水下通风口;地热流体

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