Kinetic analysis applied to aluminum citrate complexing

Abstract

Standard nonlinear regression algorithms were adapted for the treatment of simultaneous multicomponent kinetic data arising in kinetic analysis. It was observed that good initial estimates of the regression parameters must be available before successful implementation of a standard library nonlinear regression algorithm can be assured. The Guggenheim method adapted to multicomponent kinetics was incorporated into the scheme of analysis for preliminary treatment of the data to produce the necessary initial approximations. The integrated approach was applied in the treatment of kinetic analysis data from an Al 3+/Al-citrate mixture, the stability constant for the aluminum citrate complex obtained from such a kinetic analysis is 5.55 × 10 −4 at 19.5 °C. Kinetic analysis parameters on the mixtures with various ratios of Al 3+ and Alcitrate were both internally and externally consistent with results established in separate studies. Thus we present a correction of this stability constant.