Am(Ⅲ)在地下水中的溶解度  

Solubility of Am(Ⅲ)in Groundwater

作　　者：周舵[1] 龙浩骑[1] 陈曦[1] 王波[1] 包良进[1] 宋志鑫[1] 姜涛[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《原子能科学技术》2015年第5期775-779,共5页Atomic Energy Science and Technology

摘　　要：溶解度对于验证地质化学程序的有效性非常重要,而地质化学程序是迁移模型的一部分。241 Am和243 Am是高放废物深地质处置研究中须重点考虑的核素,Am溶解度的准确测定将为Am的深地质处置安全评价提供可靠的数据。本文采用过饱和法测定了低氧高纯氩气氛中,不同恒定温度下,Am(Ⅲ)在甘肃北山花岗岩地下水中的溶解度,并探讨了温度、硫酸根浓度、碳酸氢根浓度及pH值对溶解度的影响。结果显示,Am(Ⅲ)的溶解度随温度和pH值的升高而减小,随起始硫酸根浓度和碳酸氢根浓度的增大而增大。虽然由于地下水中阴离子的配合作用使Am(Ⅲ)在地下水中的溶解度有增大趋势,但由于处置库近场环境中的温度较高,偏碱性地下水中Am(Ⅲ)的溶解度在温度和pH值升高的影响下大幅减小,最终有利于处置安全。Solubility is useful in verifying the validity of geochemical codes w hich are a part of predictive transport models .241 Am or 243 Am is considered one of the most impor‐tant radionuclides in the high‐level waste （HLW） disposal study .The accurate determi‐nation of Am solubility can provide valid data for safety assessment of deep geological disposal of HLW .The solubility experiment of Am （Ⅲ） in Gansu Beishan groundwater at three different temperatures （30 ,45 and 60 ℃） were carried out . The effects of temperature ,sulfate ,carbonate and pH on solubility of Am （Ⅲ） were also investigated in a series of experiments .The results show that the Am （Ⅲ） solubility increases with the concentrations of sulfate and carbonate while the Am （Ⅲ ） solubility significantly decreases with the increases of temperature and pH .Although Am（Ⅲ） solubility in the groundwater is greater than that in the distilled water due to complexation of anion in the groundwater ,but the Am（Ⅲ） solubility in the groundwater decreases dramatically as a result of increasing temperature and pH due to higher temperature in near field＆amp;nbsp;environment of disposal repository and alkalinity of the groundwater ,which is advanta‐geous to the disposal safety .

关 键 词：Am(Ⅲ) 花岗岩 溶解度 地下水 

分 类 号：O614.353[理学—无机化学]