应用地球化学模式恢复准噶尔盆地东部浅层地下水的氧化-还原环境

地下水的ＥｈＷ值是反映其氧化还原能力的水文地球化学参数，是确定铀氧化还原环境必不可少的参数之一。在准噶尔盆地东部进行１∶５０万层间氧化带砂岩型铀矿床区调时，受工作条件限制，没能对所采集到的水样进行ＥｈＷ值测定，因而影响了对水的氧化还原能力的评价，但是这批水样分析资料中的Ｆｅ２＋／Ｆｅ３＋是非常有用的氧化还原电对，可用来模拟计算地下水环境的ＥｈＷ值。详细讨论了应用地球化学模式来模拟计算地下水ＥｈＷ值的原理和结果。

UTILIZING GEOCHEMICAL MODELLING TO RESTORE THE REDOX ENVIRONMENT OF THE SHALLOW GROUNDWATER OF EAST ZHUNGAER BASIN

The Eh W value of the groundwater indicating the capacity of reduction oxidation of the groundwater is an indispensable hydrogeochemical parameter for determination of uranium redox environment. During the period of the 1∶500000 regional exploration of the layer bound oxide zone sandstone hosted uranium deposit, the data of Eh W values of the collected water samples were unavailable due to the limitation of working condition, consequently, the evaluation of the redox capacities of the groundwater was not complete. However, the concentrations of both Fe 2+ and Fe 3+ as well as other chemical data for these groundwater samples were collected. Thus, Fe 2+ /Fe 3+ couple could be used to compute Eh W values for these samples. Using this redox couple, modelling calculations of the Eh W values of groundwater samples could be carried out by applying geochemical modelling code. This paper illustrates the theories and results of utilizing geochemical modelling to calculate the Eh W value of the groundwater.