Conventional and solid-contact lithium-selective electrodes based on tris[(N,N-dicyclohexylamide) neutral ionophore

Lithium-selective electrodes with solvent polymeric membranes based on tris[(N,N-dicyclohexylamide) neutral ionophore have been prepared and studied in conventional design (with an internal aqueous solution) and in solid-contact design with polyaniline as an ion-to-electron transducer. The dynamic range and the response slope of conventional and solid-contact electrodes are the same. One of the optional solid-contact designs studied provides a good long-term stability of readings. However, solid-contact electrodes exhibit lower selectivity to Li+ over H+ than conventional ISEs. The difference between the two kinds of electrodes is attributed to the pH sensitivity of polyaniline.