Development of pH sensor based on aromatic polyurethane matrix

The synthesized aromatic polyurethane (APU)-based all-solid-state (ASS) pH sensor was developed with the same APU-based reference site in an ASS multi sensing electrode. The best analytical performance (the linear range of pH 3.0-11.5, slopes of similar to 57 mV pH(-1)) was obtained with the membran e composition of 33:66:1 (wt.%) of APU/plasticizer (NPOE)/ionophore (N,N-di octadecylmethylamine) with the addition of lipophilic additive (KTpC1PB, 5 mol.%). This ASSE exhibits more advantages of increasing stability, reducin g membrane resistance and reducing anion interference. (C) 2001 Elsevier Sc ience B.V. All rights reserved.