痕量^(90)Sr在近海沉积物中吸附特性研究  

Studies on the Sorption Characteristics of Trace ^(90)Sr onto Offshore Sediments

作　　者：陈超[1] 朱君[1] 张艾明[1] CHEN Chao;ZHU Jun;ZHANG Ai-ming(China Institute For Radiation Protection,Taiyuan 030006,China)

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《核电子学与探测技术》2020年第5期751-755,共5页Nuclear Electronics & Detection Technology

摘　　要：本研究深入分析了滨海核设施排放^(90)Sr在表层沉积物中的吸附动力学、固体浓度(Cp)与初始浓度(C0)对吸附特性影响实验。实验结果表明:Cp=100g·L^(-1),C0=2.20×10^(-8)mol·L^(-1),吸附量随时间首先呈指数快速增长,该阶段吸附过程主要受物理吸附和离子交换机制控制,5 d后吸附趋于平衡;当C,在0.25~100g·L^(-1)之间时,^(90)Sr分配系数随C,增大明显降低,吸附体系随Cp升高吸附可逆性明显减弱;当C。在1.47×10^(-12)-1.46×10^(-9)mol·L^(-1)时,体系满足Freundlich等温线性吸附,90Sr在表层沉积物上吸附解吸分配系数随C0增大保持不变。In this study,the effects of adsorption kinetics,solid concentration(Cp)and initial con-centration(C0)on adsorption characteristics were analyzed.The experimental conditions are as follows:Cp=100g^(.L-1),C0=2.20E-08 mol·L^(-1),the observed percentage of sorption increases exponentially with time at first.In this stage,the adsorption process is mainly controlled by phys-ical adsorption and ion exchange mechanism,and the adsorption tends to equilibrium after 5 days.When C0 is between 0.25~100 g·L^(-1),the distribution coefficient of 90 Sr decreases obvi-ously with the increase of Cp.and the reversibility of adsorption system decreases obviously with the increase of Cp.The system satisfies Freundlich isothermal linear adsorption at 1.47E-12-1.46E-09 mol·L^(-1),and the distribution coefficient of 90 Sr adsorbed and desorbed on surface sedi-ments remains unchanged with the increase of C0.

关 键 词：^(90)Sr 表层沉积物 分配系数 固体浓度 初始浓度 

分 类 号：X52[环境科学与工程—环境工程]