卤化银添加剂对^(125)Ⅰ在北山花岗岩岩粉中的吸附作用研究

Influence of Silver Halide Additives on the Sorption of Iodine-125 on Beishan Granite Powder

利用柱法实验和批次实验研究了卤化银(AgCl、AgBr、AgI)对125I在甘肃北山花岗岩中的吸附现象。结果表明在无载体的情况下,卤化银添加剂有利于125I在北山花岗岩岩粉中的吸附,有效分配系数(Kd,e)均大于1.0×103 mL.g-1。在有载体的情况下,氯化银和溴化银仍然对125I在北山花岗岩岩粉中有良好的吸附作用,Kd,e大于1.0×103 mL.g-1。其中,溴化银的吸附效果最好,这可能与其晶体结构和光解性质有关。

The influence of silver halide additives （AgCl, AgBr, AgI） on the sorption of ^125I on Beishan Granite powder was studied by column and batch sorption methods. The results indicate that silver halide additives could enhance the sorption of ^125I on Beishan Granite powder with effective distribution coefficients （Kd,e） greater than 1.0×10^3mL·g^-1. When isotopic carrier of ^125I is added, silver chloride and silver bromide still enhance the sorption of ^125I on Beishan Granite Powder with Kd,e values greater than 1.0×10^3mL·g^-1. Among the three, silver bromide has the highest power in enhancing the sorption of ^125I on the granite powder, which may due to its crystal structure and photolysis ability.