Al与F的络合作用对土壤吸附Al和F的影响

研究了Al-F络合作用对土壤吸附Al和F的影响以及吸附前的溶液中铝化学形态的差异。提高Al或F的加入量将人别使分配在土壤溶液中的F或Al的数量增加，即Al-F络合作用地使Al和F在土壤固-液间的分配平衡向液相移动，土壤对Al-F络合物吸附程度很小，吸附前，3种不同F/Al比溶液中Al^3 ，AlF^2 的浓度随着F/Al比的增加逐渐降低，AlF2^ ,AlF3^0的浓度则逐渐升高，与土壤作用后，溶液中Al主要与AlF^2 ,AlF2^ 的形式存在，以AlF^2 的数量居多。

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

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 Al F complexes on soil is small. With the increase of F/Al molar ratio of solution, the amounts of Al 3+ and AlF 2+ in solution decreased while those of AlF 2+ and AlF 3 0 rose. After the interaction of soil with solution, aluminum species in equilibrium solution were dominated by AlF 2+ and AlF 2 + with the former higher than the latter.