Application of Mathematical Physicochemical Modelling in Two-Component Complexometric Titration of Microgram Amounts of Ca and Mg

摘要

A mathematical physicochemical model of spectrophotometic complexometric two-component titration has been applied in the determination of microgram amounts of Ca and Mg in solution . An excess of calmagite, a metallochromic indicator, has been applied. and EDTA has been used as the titrant. The shape of the titration curve is a result of the following relations between the conditional stability constants of the complexes , and between the effective absorption coefficients of coloured solution components: K_(Ca-Calm)