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饱和指数SI是反映水环境中矿物溶解—沉淀状态的重要参数,而水溶液中络合物的存在对SI值有很大的影响。但从微观角度而言,络合物的形成满足一定的络合平衡条件,因此正确计算络合物的含量,可提高水—岩作用SI模型的计算精度。依据化学热力学的基本理论,作者编写了计算SI值的Fortran程序,选用离子强度作为控制变量描述络合物对SI值的影响程度,结合某工程实例,证明该模型具有很好的稳定性和计算精度。
Saturation index, SI, is an important parameter that reflects the state of mineral dissolution and sedimentation in water environment. However, the existence of complex in aqueous solution has a great influence on SI value. However, from the microscopic point of view, the formation of complexes can meet certain complex equilibrium conditions. Therefore, the correct calculation of the complex content can improve the calculation accuracy of the water-rock interaction SI model. According to the basic theory of chemical thermodynamics, the author has compiled the Fortran program to calculate the SI value. The ionic strength is used as the control variable to describe the effect of the complex on the SI value. Combined with an engineering example, the model is proved to have good stability and calculation Accuracy.