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在农用稀土产品中含有多种稀土元素,主要有La,Ce,Pr,Nd,它们的氧化物占稀土氧化物总量的99％。应用~(140)La,~(141)Ce,~(147)Nd示踪方法,结合显微放射自显影技术,研究了稀土元素进入植株的过程。结果表明,稀土元素能被植物根系或叶面吸收,沿输导组织输送到器官中。由根系向地上部的输出量是Nd>Ce>Y>La,叶面吸收率和吸收速率均高于根系吸收。叶面吸收速率随时间t呈衰减趋势:Y=a·b~t。在混合稀土情况下,能促进植物对Nd的吸收,抑制对Ce的吸收。
In agricultural rare earth products contain a variety of rare earth elements, mainly La, Ce, Pr, Nd, their oxides accounted for 99% of the total rare earth oxides. The process of rare earth elements entering the plant was studied by using ~ (140) La, ~ (141) Ce and ~ (147) Nd tracing methods combined with autoradiography. The results show that rare earth elements can be absorbed by plant roots or foliage and transported to organs along the guide tissues. The output from root to shoot was Nd> Ce> Y> La, and the leaf surface absorption and absorption rate were higher than the root absorption. Foliar absorption rate decayed with time t: Y = a · b ~ t. In the case of mixed rare earths, plants can promote the absorption of Nd and inhibit the absorption of Ce.