摘要
一、前言 放射性核素在各种屏障材料上吸附分配比的测定及吸附机理的研究,是当前环境放射化学中的重要研究课题之一。放射性核素在硅酸盐矿物上的吸附机理,通常看作是阳离子交换反应。根据离子交换平衡理论,在水相pH值恒定及含有大量钠离子的条件下。
This paper discusses the sorption characteristics of the radionuclides 137Cs,45Ca,65Zn,160Tb,169Yb from the NaCl-NaAc solutions (pH = 5. 0) on kaoline, bentonite, composite zeolite in the form of attrition-resistant microspheres and Y zeolite. The batch technique is used to determine the sorption ratios of these radionuclides on some silicate minerals. It is found that lgRD (sorption ratio)is linearly dependent on lg[Na+ ](concentration of sodium ion).From the sorption characteristics it is concluded that the ion exchange mechanism and surface com-plexation mechanism may occur at the silicate mineral/NaCl-NaAc aqueous solution interface.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1992年第1期53-58,共6页
Journal of Nuclear and Radiochemistry
关键词
迁移
吸附
粘土
沸石
放射性核素
Radionuclide migration,Sorption ratio,Clay mineral,Sorption mechanism.
