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Geochemical processes controlling the groundwater chemistry and fluoride contamination in the Yuncheng Basin China—An area with complex hydrogeochemical conditions

机译:控制运城盆地地下水化学和氟化物污染的地球化学过程-复杂水文地球化学条件的地区

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摘要

Hydrogeochemical and stable isotope analyses and geochemical modeling were carried out to identify the major geochemical processes controlling the groundwater chemistry and fluoride contamination in the aquifers of the Yuncheng Basin, China, an area with complex hydrogeochemical conditions and severe fluoride contamination of the groundwater. The major findings of this case study include the following: 1) Cation exchange and salt effects are vital controls on the enrichment of fluoride in groundwater in the area by reducing the activity of Ca2+/F- in groundwater via ion complexation. Cation exchange increased the fluoride concentration by 2.7 mg/L when the Na/Ca molar ratio increased from 0.24 to 9.0, while the salt effect led to a ca. 5–10% increase in complex F- in groundwater due to the further dissolution of fluoride-bearing minerals in the aquifers, as suggested by a model calculation. 2) Anthropogenic contamination from pesticide and fertilizer use and industrial waste discharge is also a main source of fluoride in the groundwater. 3) Evaporation and ion effects favor the enrichment of fluoride in groundwater by encouraging the removal of Ca via precipitation. 4) The desorption of fluoride from mineral/organic matter surfaces is enhanced under alkaline conditions and a high HCO3 content in groundwater.
机译:进行了水文地球化学和稳定同位素分析以及地球化学模拟,以确定控制运水盆地地下水的化学和氟化物污染的主要地球化学过程。运城盆地是一个复杂的地球化学条件和地下水中氟化物严重污染的地区。该案例研究的主要发现包括:1)阳离子交换和盐分作用是通过降低Ca 2 + / F -。当Na / Ca摩尔比从0.24增加到9.0时,阳离子交换使氟化物浓度增加2.7 mg / L,而盐的作用导致Ca的增加。模型计算表明,由于含氟矿物进一步溶解在含水层中,导致地下水中复杂F -增加了5-10%。 2)农药和化肥的使用以及工业废物的排放造成的人为污染也是地下水中氟化物的主要来源。 3)蒸发和离子效应通过促进通过沉淀去除钙来促进地下水中氟化物的富集。 4)在碱性条件下和地下水中高HCO3含量的情况下,氟化物从矿物/有机物表面的解吸作用得到增强。

著录项

  • 期刊名称 other
  • 作者

    Wenting Luo; Xubo Gao; Xin Zhang;

  • 作者单位
  • 年(卷),期 -1(13),7
  • 年度 -1
  • 页码 e0199082
  • 总页数 25
  • 原文格式 PDF
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