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研究论文

Sorption of aluminum and fluoride on soil as affected by complexation of aluminum and fluoride

摘要：研究了AlF络合作用对土壤吸附Al和F的影响以及吸附前后溶液中铝化学形态的差异.提高Al或F的加入量将分别使分配在土壤溶液中的F或Al的数量增加,即AlF络合作用将使Al和F在土壤固液间的分配平衡向液相移动,土壤对AlF络合物吸附程度很小.吸附前,3种不同F/Al比溶液中Al³⁺、AlF²⁺的浓度随着FAl比的增加逐渐降低,AlF²⁺、AlF³⁰的浓度则逐渐升高,与土壤作用后,溶液中Al主要与AlF²⁺、AlF²⁺的形式存在,以AlF²⁺的数量居多.

Abstract：The sorption of aluminum and fluoride on soil as affectd by complexation of aluminum with fluoride together with the change in distribution of aluminum species in solution was investigated. The results showed that, the increase of added F led to more release of aluminum from soil. Similarly, raising the addition of aluminum resulted in more fluoride remaining in soil solution. Thus, the complexation of aluminum with fluoride may lead to the change in equilibrium between solid and solution towards solution phase, which indicated sorption of AlF complexes on soil is small. With the increase of F/Al molar ratio of solution, the amounts of Al³⁺ and AlF²⁺ in solution decreased while those of AlF²⁺ and AlF³_{02+ and AlF²⁺ with the former higher than the latter.}