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were recorded over long periods of time. The change in potential was of the same order as the drift of the blank. The pH of the solutions used in the liquid membrane studies was taken immediately following the completion of the study because the pH changed so rapidly. Hence no comparison could be made with the solid electrode studies.The results obtained with the solid membrane electrode in phosphate and borate buffers did not differ significantly. Therefore, it was concluded that phosphate must interfere in the alkylation step rather than in the cyclization reaction. CONCLUSIONSThe ion-selective electrodes used in this study offered a rapid, continuous, and simple method for the measurement of rate constants without a flow-through system. It is suggested that other electrodes could similarly be applied in reaction mechanism studies and in the determination of rate constants.

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