A Chemical Equilibrium Model for the Carbonate System in Natural Waters

摘要

This paper describes a chemical equilibrium model which can be used to characterize the carbonate system in natural waters from 0 to 50 deg. C and high ionic strengths (6 mol L~-1). The model considers the ionic interactions in solutions of the major sea salts (H-Ha-K-Mg- -Ca-Sr-Cl-Br-OH-HCO_3-B(OH)_4,HSO_4-SO_4-CO_3-co_2-b(oh)_3- -H_2O). The estimated activity coefficients and infinite dilution con- stants have been used to determine the dissociation constants of all the acids (H_2CO_3, B(OH)_3, H_2O, HF, HSO_4, H_3PO_4, H_2S, NH_4 etc.) needed to examine the carbon dioxide system in natural wa- ters.