60Co在水生生态系中的迁移富集和分布

采用模拟污染物的同位素示踪技术研究了60Co在水生生态系中的迁移、消长和分配动态。结果表明,60Co进入水中后,在水生生态系中发生沉淀或与其他离子络合或被水生生物吸收或被吸附等形式在系统中迁移和转化,从而在系统各部分中分配和积累。在引入后的很短时间内,池水中60Co的比活度迅速降至一定值后缓慢下降;底泥通过与60Co进行离子交换,富集了大量的60Co;水葫芦也可在短期内吸附大量的60Co;螺蛳和鲫鱼对60Co的吸附能力较弱,螺蛳肉中60Co的富集率大于在壳中的富集率,60Co在鱼体内的分布主要集中在内脏中。60Co在系统各部分的量均受时间的影响。

Transfer, Enrichment and Distribution of 60Co in Aquatic Ecosystem

The dynamics of transportation,accumulation,disappearance and distribution of 60Co in a simulated aquatic ecosystem was studied by isotope-tracer technique.When 60Co was introduced into aquatic system,it was transported and transformed via depositing,chelating with other ions,adsorption and absorption by aquatic living things,which resulted in the distribution and accumulation in individual part of the living things.After introduction,the specific activity of 60Co in the water decreased sharply to a certain value in a short time and then decreased slowly.The sediment accumulated a large amount of 60Co by ion exchange.The water calabash could also adsorb a large amount of 60Co in a short period of time.Snail and fish had a poor capacity of adsorbing 60Co.The amount of 60Co in the snail flesh was greater than that in the shell,and the distribution of 60Co in the fish was mainly in the viscera.The amount of 60Co in individual compartment in the system was affected by time.