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一、前言我国稀土资源十分丰富,充分综合利用,对加速实现四化具有极其重大的意义。据研究,稀土元素在土壤中和动植物以及人体内都广泛存在。土壤中含稀土氧化物一般为0.01——0.02%(湖南测定为0.015%,北京市测定为0.018%);植物灰分中约含0.02——0.03%。北京地区小麦稀土微肥试验田麦粒中含稀土氧化物0.31P P M,对照田麦粒中含0.43 P P M;人体内也含有约0.007%,动物骨灰中含有0.8%。稀土元素在人体和动植物体
I. Introduction China’s rare earth resources are very rich and fully utilized, which is extremely significant for accelerating the realization of the four modernizations. According to research, rare earth elements in the soil and plants and animals are widespread. The soil contains rare earth oxides are generally 0.01--0.02% (measured in Hunan 0.015%, Beijing measured 0.018%); plant ash contains about 0.02 - 0.03%. In Beijing, wheat grains containing rare earth oxides (0.31 P M) and wheat grains (0.43 P M) contained 0.43 P P M in wheat, and 0.007% in humans and 0.8% in animal ashes. Rare earth elements in the human body and plants and animals