摘要
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 .
Effects of phosphate on the exchangeable form and the bioavailability of exogenous neodymium (Nd) in soil were studied with 147 Nd isotopic tracer. Exchangeable Nd was extracted with solution (pH8.2) of NaAc. The results indicated that Nd beyond 99.5% was adsorbed by soil whether phosphate exists in soil or not. Phosphate can precipitate dramatically Nd 3+ . And the Nd phosphate precipitates may set limits on the concentration of exchangeable Nd observed in soil. KH 2PO 4 ranging from 0.3g·kg -1 to 1.5g·kg -1 make a uniform impact on the exchangeable form of Nd. In addition, phosphate in soil can inhibit wheat seedling to absorb Nd. The concentration of exchangeable Nd is correlated significantly with the content of Nd in wheat seedling.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2001年第3期66-69,共4页
Environmental Science
基金
国家自然科学基金!资助重大项目 (2 9890 2 80 1)
关键词
磷酸盐
交换态
生物有效性
土壤
钕
phosphate
neodymium
exchangeable form
bioavailability
