【摘要】 考察了用F-离子电极直接电位法测定土壤提取液中无机单核铝浓度并确定其形态的可靠性 ,探讨了将该方法应用于土壤研究的可行性 .结果表明 ,我国南方中强及中下强度的酸性土壤溶液中 ,无机单核铝主要是呈Al -F络合物形态存在 ,测定结果的相对误差在 4 %以内 ,且温度的变化对测定结果无明显影响 ;该方法适用于对中强及中下强度的酸性土壤提取液的测定 ,但对强酸性土壤 ,由于提取液中Al3 +与F-的浓度比发生了变化 ,溶液中游离F-的活性低于F-电极的检测下限 ,故不宜使用更多还原

【Abstract】 The reliability of fluoride electrode direct potentiometry for characterization of inorganic monomeric aluminum in AL-F system was investigated and the feasibility of this method for soil solutions was studied. The result indicated that the AL-F complexes were major inorganic monomeric aluminum for most acid to weak acid soil solutions in south China. The relative error of the results is within the range of 4%. And the change of temperature exerts little influence on the results. This determining method applies to acid or weak acid soil extracted solutions, but it’s not suitable for strong acid soils because the fluoride activeity in soil solutions is lower than the detection limit of fluoride electrode due to the AL-F concentration ratio changed with soil pH.更多还原