国内近几 10年有关稀土某些生物学效应的研究成果 ,如对植物光合作用 ,促进叶绿素生长 ,对温血动物的毒性及远期生物学效应 ;对内分泌系统 ,生长激素的刺激作用 ;对免疫系统的影响 ;对自由基抗氧化系统的影响等 ,均表明其毒理作用因素。首先是稀土的放射性物质含量致关重要 ,同时与稀土侵入机体途径也密切相关 ,如给猴静脉注入毒性大 ,而给鼠灌胃、喂饲则属低毒。还有对某些生物学效应 ,如生长刺激素和巨噬细胞的吞噬功能等 ,给大剂量对其有抑制 ,而给小剂量则有激活作用。同时研究证明 ,轻稀土在一定剂量下 ,有抗诱变、抗癌、抑制自由基和提高体内抗氧化系统等的有益作用。此外还研究了稀土在动物体内的转归 ,主要分布在网状内皮系统的骨、肝与脾。还对接触稀土作业人群 ,进行了大量的流行病学调查 ,并提出了食品与车间空气卫生标准的建议值 Recent research results on certain biological effects of rare earths, such as photosynthesis of plants, promotion of chlorophyll growth, toxicity to warm-blooded animals and long-term biological effects, stimulation of endocrine system and growth hormone, etc. The effects of the immune system; the effects of free radical antioxidant systems, etc., indicate their toxicological effects. The first is that the content of rare earth radioactive material is important, and it is also closely related to the pathway of rare earths invading the body. For example, it is highly toxic to the veins of monkeys, and it is low toxicity when the rats are fed or fed. There are also certain biological effects, such as growth stimulants and phagocytosis of macrophages, which are inhibited by large doses and activated by low doses. At the same time, studies have shown that light rare earths have beneficial effects such as antimutagenicity, anticancer, inhibition of free radicals, and enhancement of the body’s antioxidant system at certain doses. In addition, the outcomes of rare earths in animals have been studied, mainly in the bone, liver and spleen of the reticuloendothelial system. A large number of epidemiological investigations have also been carried out on workers exposed to rare earths, and suggested values ​​for food and workshop air hygiene standards have been proposed.