伊利石对碱性盐化土壤中镉形态的影响

目的]研究不同伊利石添加量对碱性盐化土壤中重金属镉形态的影响及达到吸附稳定的时间。方法]采用Tessier连续提取法。结果]在pH为7.93的土壤溶液中,黏土矿物伊利石的添加使得土壤中重金属镉的有效态逐渐减少,其有效态减少总量从2.047mg/kg增加到3.103 mg/kg,铁锰氧化态和碳酸盐态均有不同程度的升高,有机结合态变化不明显,在吸附行为发生14 d左右基本达到平衡,最后出现少量的离子"释放"。结论]伊利石对碱性盐化土壤中镉形态有较显著的影响。

Influence of Illite on State of Cadmium in Alkaline Saline Soil

Objective] The research aimed to study the influence of different adding amount of illite on the state of cadmium in alkaline saline soil and adsorption equilibrium time.Method] Tessier’s sequential extraction procedure was adopted.Result] In the soil solution of pH 7.93,the effective state of cadmium in soil gradually decreased with the addition of silicate clay mineral illite,and its total reduction increased from 2.047 mg/kg to 3.103 mg/kg.The ferric-manganese oxidation state and carbonate state increased at different rates,and the form of organic combination state didn’t change significantly.The balance achieved basically by the adsorption behavior in about 14 days.At last,a small amount of ion was released.Conclusion] The influence of illite was remarkable on the state variation of cadmium in alkaline saline soil.