【摘要】 以大同盆地地方氟病地区土壤为研究对象,采用连续化学提取法逐级提取土壤中水溶态、离子交换态、铁锰结合态、有机束缚态和残余态的氟,研究了大同盆地土壤中氟的赋存形态特征以及控制土壤中氟赋存形态的因素,进而探讨了土壤中氟氧化物迁移与转化对大同盆地高氟地下水形成的影响。结果表明:研究区土壤中氟的5种赋存形态按含量大小呈现出残余态氟水溶态氟>交换态氟>有机束缚态氟>铁锰结合态氟的分布规律;相关分析显示水溶态氟与铁锰结合态氟呈现正相关性,离子交换态氟与有机束缚态氟和铁锰结合态氟呈现显著正相关性;大同盆地土壤中氟的背景值较高(545.29mg/kg),并在一定条件下各种形态的氟相互转化,可提供更多自由态的氟进入地下水中,从而形成高氟地下水。更多还原

【Abstract】 This paper takes soil samples from endemic fluorosis-impacted areas of Datong Basin as the study objects,analyzes the species of fluorine in soil samples by using sequential chemical extraction procedure and separates the species of fluorine into five fractions:water soluble fluoride(Ws-F),exchangeable fluoride(Ex-F),fluoride bound to Fe/Mn oxides(Fe/Mn-F),fluoride bound to organic matter(Or-F)and residual fluoride(residual-F).The contents of different fluoride forms are decreasing in the order:residual fluoride(residual-F)water soluble fluoride(Ws-F)>exchangeable fluoride(Ex-F)>fluoride bound to organic matter(Or-F)>fluoride bound to Fe/Mn oxides(Fe/Mn-F).The results of correlation analyses show that Ws-F is correlated with Re-F and Ex-F is significantly correlated with Or-F and Fe/Mn-F.The average content of fluorine in soils of Datong Basin is 545.29mg/kg and different forms of fluorine can be mutually transformed under favorable conditions and provide more free states of fluoride into the groundwater.更多还原