稀土金属离子对梨形四膜虫(Tetrahymena pyriformis)的生长毒性  

GROWTH TOXICITY OF RARE EARTH ELEMENT IONS TO Tetrahymena pyriformis

作　　者：孔志明[1] 王永兴[1] 章敏[1] 王晓蓉[1] 

机构地区：[1]南京大学环境科学与工程系

出　　处：《南京大学学报（自然科学版）》1998年第6期752-755,共4页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金!29677006

摘　　要：采用S1上海梨形四膜虫（Tetrahymenapyriformis）进行金属离子La3+.Sm3+.Y3+.Gd3+的24h和96h生长毒性试验．结果表明La3+，Sm3+．Y3+在低剂量下均表现出对四膜虫的刺激效应．但在高剂量时上述四种稀土金属离子都表现出抑制效应．而且随着浓度的升高．抑制作用增强．其毒性大小顺序为Gd3+＞Y3+＞Sm3+＞La3+，并且重稀土的毒性要高于中稀土．轻稀土的毒性．Using freshwater protozoan (Tertanymena pyriformis) as test material, the growth toxicity ofrare earth element(REE) ions La3+ .Sm3+ .Y3+ and Gd3+ were studied. The results of 24h and 96h population growth assay showed that the growth of Teteahmena pyriformis was stimulated at comparatively lower concentrations when treated with La3+ .Sm3+ .Y3+. However, at higher concentrations the growth wasinhibited by all tour REE ions. Compared with the IC50 values. the sequence of toxicity was Gd3+＞Y3+＞Sm3+＞La3+.

关 键 词：梨形四膜虫 稀土离子 环境毒理学 生长毒性 

分 类 号：R994.6[医药卫生—毒理学]