High Sensitive and Selective Hydrogen Phosphate ISFET Based on Polyvinyl Chloride Membrane

The present work describes the preparation and characterization of polyvinyl chloride membrane doped with methyl-salin ionophore.This electrode was successfully used for selectivity and high sensibility of monohydroxiphosphate in aqueous solution.1 µM detection limit of mono-hydrogen phosphate was obtained by using dibutyl phthalate and o-nitrophenyl octyl ether-poly vinyl chloride membrane in dynamic solution.The co-existence of a large excess of salts did not interfere with the detection in case of onitrophenyl octyl ether-poly vinyl chloride membrane that maked this selective electrode more adequate for the monohydrogen detection.Also, a highly selective and sensitive dihydrogen phosphate sensor was fabricated by autoassembly of polyvinyl chloride into silicium nitride gate of ISFET.