放射性核素^(60)Co在蚕豆-土壤系统中的迁移动力学  

Transference kinetics of radioactive nuclide cobalt-60 in broadbean-soil system.

作　　者：赵希岳[1] 史建君[1] 王寿祥[1] 陈传群[1] 

机构地区：[1]浙江大学原子核农业科学研究所,农业部核农学重点开放实验室,浙江杭州310029

出　　处：《中国环境科学》2002年第5期425-428,共4页China Environmental Science

基　　金：国家自然科学基金资助项目(39570149)

摘　　要：采用模拟污染物的同位素示踪技术研究了60Co在蚕豆-土壤系统中的迁移和分配动态.结果表明,60Co由表层土壤进入系统后即在系统中发生迁移,经根吸收的60Co能够向其他各部位迁移.蚕豆植株中60Co比活度起初随时间迅速增高,当达到某一最大值后开始下降.根中60Co比活度显著高于植株的其他部位,蚕豆各部位中60Co比活度的大小顺序为根>豆秸>豆壳>豆粒;土壤中60Co主要滞留于表层6cm内,其比活度与距土壤表层深度呈单项指数负相关;60Co在蚕豆-土壤系统中比活度的动态变化规律由多项指数描述;蚕豆对土壤中的60Co具有一定的富集能力.The dynamics of transportation and distribution of 60Co in the broadbean-soil system was studied using isotope-tracer techniques for simulated pollutants. Results showed that 60Co was transported promptly in the system after it was put into the system from surface layer of soil. 60Co absorbed by broadbean root could be transferred into other parts of broadbean. The specific activity of 60Co in broadbean increased rapidly at the initial stage, then decreased as it reached a maximum value. The specific activity in root was distinct higher than that in the other parts of broadbean plant, The specific activity of 60Co in each part of broadbean plant follows the order of root > straw > husk > seed. 60Co was detained mainly in 6cm of soil surface, and its specific activity was an individual exponential declining with soil depth. The dynamic rule of 60Co in the broadbean-soil system could be described with multinomial exponential. The broadbean had definite ability to accumulate 60Co from soil.

关 键 词：放射性核素 ^60CO 蚕豆 土壤 迁移动力学 生态系统 

分 类 号：X171[环境科学与工程—环境科学] X131