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用放射性同位素14 7Nd示踪法 ,以pH8 2的NaAc为土壤中交换态Nd的提取剂 ,研究了磷酸盐对土壤中外源Nd的交换态及生物有效性的影响 .结果表明 ,无论磷酸盐存在与否 ,加入土壤中的Nd 99 5%以上均被吸附 .磷酸盐对稀土离子具有较强的沉淀作用 ,能够降低土壤中交换态Nd的含量 ,在实验中发现 ,KH2 PO4 在 0 3g·kg-1～ 1 5g·kg-1范围内土壤中交换态Nd含量无明显变化 .另外实验表明磷酸盐还具有降低小麦对Nd吸收的作用 ,分析得出土壤中交换态Nd浓度与小麦幼苗中Nd含量存在显著相关性 .
The effect of phosphate on the exchangeability and bioavailability of exogenous Nd in soils was investigated by radioactive isotope 14 7Nd tracing method and pH 8 2 NaAc as extractant for the exchangeable Nd in the soil.The results showed that regardless of the presence of phosphate Or not, more than 5% of Nd added to the soil is adsorbed.Phosphate has a strong precipitation effect on rare earth ions, which can reduce the content of exchangeable Nd in the soil. In the experiment, it was found that KH2PO4 was at 0 3g · kg In the range of -1 ~ 15g · kg-1, there was no significant change in the exchangeable Nd content in the soil.Experiments also showed that phosphate also had the effect of reducing the absorption of Nd to wheat, and the results showed that the exchangeable Nd concentration in soil was similar to that of Nd There is a significant correlation between content.