【摘要】 以地下水污染调查数据为基础,分析兰州市地下水中氟分布规律及影响因素。结果表明氟含量具有浅层地下水大于深部地下水的垂直分带性,由于受人类活动的影响,水平分带性不明显。地层中含氟矿物的溶解是地下水中氟的重要来源,土壤盐渍化成为氟释放的积极促进因素;氟的富集与贫化与水化学特征关系紧密,高硫酸根、钠离子的碱性水环境有利氟的溶解与富集;受径流路径及地形条件的影响,河谷平原区氟含量大于丘陵山地及其边缘地区;工业污染源是引起地下水氟升高的潜在因素,水源地开采对氟分布具有明显的驱动作用。更多还原

【Abstract】 Based on groundwater pollution survey,this paper analyzes the distributing regularity and influencing factors of fluorine in Lanzhou City,Gansu Province. Results show that fluorine content in shallow groundwater is greater than deep groundwater. Due to the impact of human activities,the horizontal zoning is not obvious. The fluorinated mineral dissolution in stratum is an important source of fluorine in groundwater. Soil salinization is a positive contributing factor to the fluorine releasing. There are close relationship between high fluorine and the hydro-chemical characteristics. In the alkali water with higher contains of SO42-and Na+,the fluorine can be easily dissolved and rich in water. Generally,affected by runoff paths and topographic conditions,fluorine content in valley plains is greater than hilly and its marginal areas. Industrial pollution is a potential factor of elevated fluorine content. Groundwater exploitation has an obvious driving action for fluorine distribution.更多还原