铁锰氧化矿物添加对土壤镉有效态及生物效应的影响

利用铁锰氧化矿物对土壤中镉的吸附特性,研究了镉污染的土壤中施加铁锰氧化矿物后对土壤中镉的有效态及植物有效性的影响,结果表明：在土壤中添加铁锰氧化矿物后,土壤中镉的有效态含量明显降低;铁锰氧化矿物对土壤中镉的吸附在十天左右达到平衡;在相同的加入量,软锰矿比针铁矿的吸附效果好;利用数量化理论预测法,建立了氧化矿物加入量和土壤中镉含量及理化性质之间关系的预测模型,预测精度较好;通过温室土培试验,几种植物添加铁锰氧化矿物后镉的总量明显降低,证明添加铁锰氧化矿物可以明显降低土壤中镉的生物有效性。

Influence of Fe-Mn Oxides in Contaminated Soil on Bio-availability and Effective Form of Cd

The impact of iron-manganese oxide minerals added in cadmium-contaminated soil on effective form and phytoavailability of cadmium was studied. The effective form content of cadmium in the soil were significantly lower after Fe-Mn oxide minerals were added in the soils; It was about 10 days that the adsorption quilibrium of cadmium in the soils by Fe-Mn oxide minerals was reached after Fe-Mn oxide minerals were added in the soils; The adsorption effect of cadmium by Mn-oxide was better than by Fe-oxide when added quantity of Fe-Mn oxide minerals was the same; Using the quantity theoretical prediction model, the added oxide minerals quantity model was established and the added oxide minerals quantity could be forecasted based on the content of cadmium in the soils and the soil physical and chemical properties; The content of cadmium in plants could be reduced significantly after Fe-Mn oxide minerals added into the soils by greenhouse experiment, so Fe-Mn oxide minerals could be used for remediation of polluted soils.