中文摘要：

利用小型鱼日本青鳉考察MFI型纳米分子筛对有毒重金属离子（Cu2＋、Cd2＋）生物有效性的影响,并通过静态平衡实验探讨MFI型纳米分子筛对重金属的吸附行为。暴露3 d,MFI型纳米分子筛可降低Cu2＋、Cd2＋的生物有效性;暴露10 d,MFI型纳米分子筛对Cu2＋、Cd2＋生物有效性的影响减小;清除7 d后,MFI型纳米分子筛对Cu2＋有促进清除的作用,而对Cd2＋清除无促进作用。静态平衡实验中比较了MFI型纳米分子筛与4A分子筛的吸附行为,结果发现,MFI型纳米分子筛对Cu2＋、Cd2＋的吸附性能远小于4A分子筛。结果表明,全硅型纳米分子筛难以有效降低重金属的生物有效性,其机制可能与分子筛组成有关。

英文摘要：

Influence of MFI nano-zeolite on the bioaccumulation of waterborne Cu2＋ and Cd2＋ was investigated in medaka fish static exposure experiment.The results indicated that the bioaccumulation of tested metals was reduced by MFI nano-zeolite after 3 days exposure.Nevertheless,significant decrease in that influence was observed after 10 days of exposure.Additionally,clearance of copper and cadmium from medaka body could not be changed by MFI nano-zeolite.The adsorption behavior of MFI nano-zeolite was compared with the commercial 4A zeolite in static adsorption experiment.Results showed that the adsorption capacity of nano-zeolite for Cu2＋ and Cd2＋ was lower than that of 4A zeolite.This experiment suggested that the bioavailability of Cu2＋ and Cd2＋ may not be altered by MFI nano-zeolite treatment,in which the mechanism could mainly be attributed to their composition.