【摘要】 研究了¹⁴¹Ce在模拟水稻田和模拟水生生态系中的迁移、积累和分布。结果表明:（1）¹⁴¹Ce引入田水后,水中¹⁴¹Ce的浓度迅速下降。水稻主要经根部吸收¹⁴¹Ce,然后在稻株各部位中再分配。¹⁴¹Ce在模拟水稻田中移动性较差,土壤对¹⁴¹Ce的吸附迅速,吸附率较高,93％以上的¹⁴¹Ce滞留于表层4cm之内。¹⁴¹Ce在模拟水稻田中的动态变化可用封闭三分室模型描述。（2）¹⁴¹Ce进入模拟水生生态系后,因物理、化学作用很快产生吸附、凝聚、络合沉淀,并为水生生物及底泥吸附、吸收。底泥对¹⁴¹Ce有很强的吸附能力。水生生物对¹⁴¹Ce的富集能力依次为:金鱼藻>螺蛳>鱼。¹⁴¹Ce在模拟水生生态系中的行为规律可用封闭五分室模型描述。更多还原

【Abstract】 Studies on the transport, accumulation, and distribution of 141Ce in simulated paddy and simulated aquatic ecosystem were done. The results are as follows: (1) The concentration of 141Ce in water decreased sharply when 141Ce was put into the paddy through water. The upstake of 141Ce by rice was mainly via root,and redistribution in all parts of rice occurred consequently. 141Ce which was rapidly and almost completely adsorbed by soil could not move readily through the soil,and over 93 per cent of that was retained within 4 centimeter of the surface layer. The dynamic behavior of 141Ce in the paddy could be described as a closed three-compartment model. (2) After 141Ce was put into the aquatic ecosystem, the adsorption, condensation , complexation and deposit of 141 Ce were quickly generated by physical and chemical processes, and then most of that was adsorbed by silt, aquatic plants and animals. Silt had a great capability of adsorbing 141Ce. The concentration capability of aquatic for 141Ce have the order of: hoenwort>snail>fish. A closed five-compartment model was applied to describe the behavior of 141Ce in the aquatic ecosystem.更多还原