Glass surfaces modified with N-2-aminoethyl-3-aminopropyltrimethoxysilane have been titrated with copper(II) by constant rate thermometric titration and by manual potentiometric titration with Gran plot end-point location. The results indicate that the titrant reacts with the bound ligand in a two-step process, with the thermometric titration responding to the first step and the potentiometric titration responding to the combined steps.
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R. J. K. acknowledges the financial support of the 3M Company in the form of a fellowship. Acknowledgment is made to the donors of The Petroleum Research Fund, administered by the ACS for partial support of this research (grant 10733-G3) and to the National Institutes of Health (grant ROl-GM27581-01).