摘要
在有氧条件下，用静态实验法研究了放射性核素^（９９）Ｔｃ在各种土壤中的吸附行为，并研究了土壤的特性和土壤平衡水的ｐＨ和Ｅｈ值。选择活性炭和还原铁粉作添加剂，与砂土混合作为人工土壤，研究放射性核素^（９９）Ｔｃ在人工土壤中的吸附行为。结果表明，^（９９）Ｔｃ在天然土壤（格列土除外）中的吸附比很低，人工土壤中的吸附比很高，并且随着添加剂的质量分数和接触时间的增大而增大。对核素吸附的物理化学过程和可能的吸附机理也进行了讨论。
The sorption behaviour of technetium in different soils has been studied by batch experiments under aerobic conditions.The soil samples have been taken to study the characteristics and to derive the pH-Eh values,In addition,the activated carbon and reduced iron powder have been selected as additives to the JAERl sand according to our former research work,so that the technetium sorption behaviour in the artifical soils can be studied under similar conditions.The experimental results show that all these soil samples except for the gley soil have a very small distribution coefficient for Tc,while the artifical soils have a very large distribution coefficient for Tc.Besides,for artificial soils,the distribution coefficient(Rd)values will become larger and larger when more additive is added and more contact time is allowed.The physico-chemical fixation processes and possible sorption modes have been discussed as well.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1996年第1期56-60,共5页
Journal of Nuclear and Radiochemistry
基金
日本科技厅(STA)交流项目
关键词
土壤
吸附
静态实验
吸附比
锝99
Soils Sorption behaviour Batch experiment Distribution coefficient
