尕斯库勒盐湖水中铀形态分布及影响因素研究

Analysis on uranium existing forms and its affection factors in saline-water of Gas Hure Lake

铀在水溶液中形态分布复杂,直接测量困难,分析数据使用相关软件依据热力学常数计算铀的形态分布简单可行。以尕斯库勒地区盐湖水为例,应用地球化学软件PHREEQC进行模拟计算,实验受pH值、温度、阴离子强度等因素影响。结果表明,在pH=8~10之间盐湖水中铀以UO_2(CO_3)_3^(4-)为主要存在形态。盐湖水中铀的形态分布主要受pH值影响,但温度及阴离子强度对于盐湖水中U的存在形式的影响不明显。

Uranium has lots of species in aquatic solution. It is difficult to measure the distribution of uranium species while they can be calculated by many geochemical softwares. In this paper, PHREEQC with a database was employed to study uranium species in saline-water of Gas Hure Lake. The influences of pH, temperature, concentration of the anionic on the sorption behavior are also studies. The results of calculation show that the main species of uranium are UO2（CO3）34- at pH 8--10, and the influence of temperature and anionic to the existing form of uranium in this ease is very small. Meanwhile, the results shew that pH had strongly effect on the chemical speciation of uranium.