研究论文
朱茂旭,蒋新,和文祥,王芳,杨杰文.土壤与酸性含氟溶液相互作用特征及机理研究[J].环境科学学报,2001,21(4):465-469
土壤与酸性含氟溶液相互作用特征及机理研究
- Study on characteristics and mechanisms of interaction between selected soils and fluoride-bearing acidic solutions
- 基金项目：国家自然科学基金项目(49831005;49904005);国家博士后科学基金项目;国家重点基础研究发展规划项目(子课题编号:G19
- 作者
- 单位
- 朱茂旭
- 中国科学院南京土壤研究所,南京 210008
- 蒋新
- 中国科学院南京土壤研究所,南京 210008
- 和文祥
- 中国科学院南京土壤研究所,南京 210008
- 王芳
- 中国科学院南京土壤研究所,南京 210008
- 杨杰文
- 中国科学院南京土壤研究所,南京 210008
- 摘要：通过反复多次提取实验方法模拟了酸性含氟溶液与红壤和赤红壤相互作用过程.结果表明:在相互作用过程中,土壤中氟含量不同对土壤溶液pH有明显不同的影响.当氟含量较低时氟离子对土壤溶液pH的影响不明显;当浓度较高时则可大大提高土壤溶液的pH,缓冲土壤酸化.在第一次提取中因氟的大量吸附可减少溶液中铝的浓度,且氟含量越高铝浓度减少量越大.随提取次数增加土壤溶液中铝、氟浓度同时增加,且氟含量越高铝浓度越大,其中氟以Al-F络合物为主.
- Abstract：An interaction between two selected soils and fluoride bearing acidic solutions was modeled with a prolonged equilibrium extraction experiment. The results showed: that the variation of pH of soil solution are depends strongly on the content of fluoride in soil. When the concentration of fluoride is low, its influence on pH is slight.However the pH of soil solution rises much pronouncedly when the concentration of fluoride is high, which therefore buffers pH further decrease to acidify soil. In the initial extraction, both the concentrations of fluoride and aluminum in soil solutions are relatively low due to a dominant adsorption of fluoride on soil surface. On the contrary, with the increase of the number of extractions both the concentrations of Al and F increased.In soil solution, Al-F complex is the dominant species.
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