| 沉积物岩性及水化学性质对水土界面氟迁移行为的影响 |
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| 引用本文： | 朱亚鹏,苏春利,梁川,向鸿燕.沉积物岩性及水化学性质对水土界面氟迁移行为的影响[J].地质科技通报,2015,34(5):160-165. |
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| 作者姓名： | 朱亚鹏 苏春利 梁川 向鸿燕 |
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| 作者单位： | 1. 中国地质大学环境学院, 武汉 430074; |
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| 基金项目： | 国家高技术发展计划(863计划)项目(2012AA062602) |
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| 摘 要： | 水土界面氟的迁移对高氟地下水的形成具有重要影响。以大同盆地典型氟中毒区为例,分析了不同岩性沉积物中的氟质量分数和形态分布特征,并通过室内静态实验,探究了水溶液的pH值、Ca2+、HCO-3以及H2PO-4质量浓度对水土界面氟迁移的影响。研究结果表明,沉积物中不同形态氟按含量由高到低的顺序依次为:残余态氟≥铁锰氧化态氟>水溶态氟>有机束缚态氟>离子交换态氟;各形态氟在不同岩性沉积物中含量大小均表现为:黏土>粉质黏土>粉砂;在沉积物中,黏土矿物和方解石是主要的固氟矿物成分。溶液的pH值、Ca2+、HCO-3以及H2PO-4质量浓度与氟在沉积物表面的吸附-解吸和沉淀-溶解平衡密切相关,沉积物对氟的吸附量随溶液pH值和HCO-3质量浓度增大而降低,随Ca2+和H2PO-4质量浓度增大而增大。
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| 关 键 词： | 氟 沉积物 水化学特征 迁移 |
| 收稿时间： | 2015-05-22 |
Effects of Sediment Lithology and Groundwater Hydrochemical Characteristics on Fluorine Transport at Water-Soil Interface |
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| Institution: | 1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. Geological Environmental Center of Hubei Province, Wuhan 430034, China |
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| Abstract: | Fluorine transport at water-soil interface affects formation of high fluoride groundwater.High fluoride groundwater occurring in Datong Basin is a serious problem,which is typical in China.In this paper,efforts were made to analyse the distributional characteristics of fluorine content and fluorine forms in the sediments of different lithologies,and to investigate the influence of pH,Ca2+,HCO-3 and H2PO-4 on fluorine transport at water-soil interface using static experiments.The results show that contents of different fluorine forms in sediments descended in the following sequence:residual F ≥Fe/Mn oxide-F>water soluble F>organic F>exchangeable F.The order of fluorine contents in the aforementioned forms in different lithologies is:clay>silty clay>silt,in which clay minerals and calcite are main fixed fluorine minerals in sediments.In addition,the solution pH value and the concentrations of Ca2+,HCO-3 and H2PO-4 are closely related to adsorption-desorption and dissolution-precipitation equilibrium of fluorine on the surface of sediments.The adsorption capacity of sediments on fluorine decreases with increasing pH and HCO-3concentration,but increases with the concentration of Ca2+ and H2PO-4. |
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