Liquid Membrane Electrodes Based on Neutral Carriers

Abstract

For analytical applications neutral carriers are incorporated into artificial bulk liquid membranes for ion-selective electrodes. The membranes form an organic phase which separates the aqueous sample solution from the aqueous internal filing solution of the electrode. Ideally, a liquid membrane should be a homogeneous permselective barrier. Neutral carriers are highly suited for use in such artificial liquid membranes. They are capable of selectively extracting ions from an aqueous sample solution into the membrane phase and transporting these ions across the organic barrier by carrier translocation (Fig. 4.1).