我国稀土资源丰富,稀土作为肥料施用于农作物后,不仅残留于食品,而且污染环境。关于长期接触该类化合物的慢性毒性和致癌性,是一个令人关心的问题,为此,我们进行了本研究。 实验材料和方法 实验样品为混合稀土硝酸盐,其纯度为99％以上,稀土总含量(以氧化物计)为38～40％。实验动物由中国医学科学院实验动物中心提供的刚断乳Wistar大白鼠,体 Rare earth resources in our country rich, rare earth as fertilizer applied to crops, not only remain in the food, but also pollute the environment. Chronic toxicity and carcinogenicity of long-term exposure to this class of compounds is a concern, and we conducted this study. Experimental materials and methods The experimental sample is a mixed rare earth nitrate with a purity of over 99% and a total rare earth content (calculated as oxide) of 38 to 40%. Experimental animals from the Chinese Academy of Medical Sciences Laboratory Animal Center just weanling Wistar rats, body