黄泛沉积物中水溶性氟的垂向分布及水文地球化学特征

Vertical distribution and hydrogeochemical characteristics of water-soluble fluorine in flooding sediment of Huang river

徐州地区是典型的黄泛区,地下水中氟的含量很高,地氟病情严重。为了研究氟的水文地球化学特征,该文对150m深的钻孔岩芯进行了取样,对地层剖面中的32组样品的水溶性氟、pH值及主要水溶性化学组分进行了测试,研究了徐州丰沛地区第四系地层水溶性氟垂向分布特征。结果表明,F-含量范围5.59～31.66mg/kg,平均值为11.72 mg/kg,其含量随着地层深度增加明显降低;浸提液中F-与其他化学组成密切相关,F-含量与pH值、Ca2+含量、Cl-含量呈负相关,与HCO3-含量呈显著正相关;样品浸提液的水化学类型有HCO3-Mg型、SO4.HCO3-Mg型和SO4.HCO3-Mg.Ca型,在上述类型中F-含量从高到低。

Xuzhou is the typical Huang River flooding area. Endemic fluorosis is very popular because of high fluorine concentration in groundwater and soil. In this study, 32 groups of sediment samples were collected from a 150m deep hole. The contents of water-soluble F, main water-soluble chemical components and pH were analyzed in laboratory. Vertical distribution and hydrogeochemical characteristics of water-soluble F in quaternary system stratum were primarily studied. The result shows that the contents of Frange from 5.99mg/kg to 31.66mg/kg, averaging 11.72mg/kg and it decreases obviously when the depth of stratum increases. Contents of Ca^2＋, Cl^- and pH have a negative correlation with content of F^- in vertical profile, while HCO3^- has a positive correlation at a level of significance. The extracting solution hydrochemical types of sediment samples are HCO3^-Mg, SO4·HCO3-Mg and SO4·HCO3-Mg·Ca. In the types above, the contents of F^- are from high to low.