Nonmonotonic transient potential signals with an 18-crown-6 based ion-selective electrode in a flow-injection system

摘要

The dynamic potential response of an 18-crown-6 based ion-selective electrode towards Li+, Na+, K+ and Ca2+, in a flow-injection system is studied. Different double nonmonotonic transient signals are obtained for the different ions. The influence of the flow-injection variables and of ion concentration on the signals is studied. Two signal parameters, the relative return rates, are found to be characteristic for each ion and are constant for a concentration range of 1-3 decades. The nonmomotonic transient signals obtained are explained by reference to the theoretical models reported. [References: 27]