塔木素地下水中的钍种态分布的模拟研究

The Species Distribution of Thorium in the Groundwater of Tamusu and It's Influence Factors

塔木素拥有大片的粘土岩,具有作为高放废物地质处置场的前景。本文运用PHREEQC模拟了塔木素地下水中钍元素的种态分布,对影响钍种态分布的温度,p H、p E条件进行讨论并分别研究其变化规律。塔木素地下水中的钍主要以Th(OH)4,Th(OH)+3,Th(OH)2+2的形式存在,其中Th(OH)4占绝对优势。随着温度的上升,Th(OH)4逐渐下降,而Th(OH)+3,Th(OH)2+2则逐渐上升。p E值对其种态分布几乎无影响。

Tamusu has a large clay rock,which is a potential geological disposal site for high- level radioactive waste. The species distribution of Thorium in Tamusu groundwater was calculated. The influence factors such as temperature,p H and p E were studied. The result show that main species of thorium are Th（ OH）4,Th（ OH）＋3,Th（ OH）2 ＋2in the groundwater,and the Th（ OH）4is the dominant species. With the temperature increasing,the ratio of Th（ OH）4decreases while the ratio of Th（ OH）＋3and Th（ OH）2 ＋2increases. The p E value has little effect on the species distribution of the thorium species.