平衡常数的计算

METHODS FOR COMPUTING THE EQUILIBRIUM CONSTANT

配合物离解和矿物溶解等地球化学反应的平衡常数（K）是地球化学计算最重要的热力学参数之一,它是由一定pT条件下实验测得的有关热力学数据计算出的,由于对各种反应的实验研究条件和程度不一,计算条件和精度要求各异,因此,对于每一具体反应应根据不同的需要和已有的热力学数据求取平衡常数,本文综述了不同条件下求取平衡常数的方法,并简要评述了平衡常数的可靠性。

The equilibrium constant (K) for the geochemical reactions , such as the dissociation of aqueous complexes and dissolution of minerals,is one of the most important thermodynamic parameters for the geochemical calculations and is computed by the experimental data measured from thermodynamic experiments at various pT conditions. Because of the difference of experimental conditions and study levels for different reactions and various requirements of computing conditions and experimental precision, it is necessary to use different methods to compute the equilibrium constant (K) for a given reaction from the experimental thermodynamic data available. The computing methods for equilibrium constants at different conditions are summarized and its reliability has been briefly reviewed.