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Contribution of cadmium detected in groundwater monitoring wells from lignite of the Yegua Formation, Angelina County, Texas.

机译:在得克萨斯州安吉丽娜县耶瓜组褐煤的地下水监测井中检测到的镉的贡献。

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摘要

The Angelina County Waste Management Center (ACWMC) has three on-site groundwater monitoring wells that consistently have levels of cadmium (Cd) above the maximum contaminant level (MCL) for drinking water. The ACWMC is excavated into the Eocene Yegua Formation which contains lignite seams. Oxidation of the lignite seams contributes to Cd concentrations detected in monitoring wells. Lignites from the study area were analyzed and found to have between 0.54 and 3.98 ppm of Cd per 0.5g sample. Near well MW-12A, there is an estimated volume of 625ft3 (18m3) of lignite, which contains a calculated value of 27g to 201g of Cd. Oxidation of organic matter and sulfides in the lignite cause the groundwater to become acidic and leach metals such as Cd from the lignite. This oxidation is a result of the excavation of the landfill, which allowed oxygenated waters to interact with subsurface lignite.
机译:安吉丽娜县废物管理中心(ACWMC)拥有三个现场地下水监测井,这些井的镉含量始终高于饮用水的最大污染物含量(MCL)。 ACWMC被开挖到包含褐煤接缝的始新世耶瓜组。褐煤接缝的氧化有助于在监测井中检测到Cd浓度。对研究区域的褐煤进行了分析,发现每0.5g样品中Cd含量为0.54至3.98 ppm。在MW-12A井附近,估计褐煤量为625立方英尺(18立方米)褐煤,其计算值介于27克至201克之间。褐煤中有机物和硫化物的氧化导致地下水变成酸性,并从褐煤中浸出金属,例如Cd。这种氧化是垃圾填埋场开挖的结果,这使含氧水与地下褐煤发生了相互作用。

著录项

  • 作者

    Stonecipher, Marcy Ann.;

  • 作者单位

    Stephen F. Austin State University.;

  • 授予单位 Stephen F. Austin State University.;
  • 学科 Geology.
  • 学位 M.S.
  • 年度 2007
  • 页码 85 p.
  • 总页数 85
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

  • 入库时间 2022-08-17 11:40:26

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