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研究了低氧条件下Tc在花岗岩上的吸附、解吸和扩散,内容包括溶液pH、含铁矿物(还原铁粉和Fe_3O_4)、膨润土、阴、阳离子浓度(CO_3~(2-)、Fe~(3+)、Fe~(2+)对Tc在花岗岩(石英、黑云母)上吸附Kd值的影响;在解吸剂中加入H_2O_2,对Tc进行解吸,探讨其吸附机理;将扩散系数代入扩散方程的解析解,预测了10 000年后Tc的扩散距离。实验结果表明:低氧条件下Tc的行为具有如下特点。
The adsorption, desorption and diffusion of Tc on granite under hypoxic conditions were investigated. The effects of solution pH, iron minerals (reduced iron and Fe_3O_4), bentonite, anion and cation concentrations (CO_3 ~ (2 -), Fe ~ (3 +) and Fe ~ (2+) on the Kd value of Tc adsorbed on granite (quartz and biotite). H 2 O 2 was added to the desorbent to desorb Tc to explore the adsorption mechanism. The diffusion coefficient was substituted into diffusion The analytical solution of the equation predicts the diffusion distance of Tc after 10,000 years.The experimental results show that the behavior of Tc under hypoxic conditions has the following characteristics.