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研究了141Ce在模拟水稻田中的迁移、积累和分布。结果表明,141Ce进入田水后向土壤和水稻迁移,水中141Ce浓度迅速下降。水稻中141Ce浓度显著地高于土壤和田水。田水和土壤中的141Ce浓度随时间延长基本上单调降低,而水稻中141Ce浓度则在经历某一最大值后便下降。土壤对141Ce的吸附迅速,吸附率较高,95%以上的141Ce滞留于表层4cm之内;土壤中141Ce浓度与离表面深度呈单项指数负相关。
The migration, accumulation and distribution of 141Ce in simulated paddy fields were studied. The results showed that 141Ce migrated to soil and rice after entering field water, and the concentration of 141Ce in water rapidly decreased. The concentration of 141Ce in rice was significantly higher than that of soil and water. The 141Ce concentration in field and soil decreased monotonically with time, while the 141Ce concentration in rice decreased after experiencing a certain maximum. The adsorption of 141Ce in soil was rapid and the rate of adsorption was high. More than 95% of 141Ce remained in the surface within 4cm. The 141Ce concentration in soil had a single exponential negative correlation with the depth of surface.