Anion effects on Donnan failure of aminated-poly(vinyl chloride)-based and neutral-carrier-based pH sensors

Abstract

Aminated poly(vinyl chloride)s (PVCs) and neutral carriers can produce nearly ideal pH sensors. However, they can show Donnan exclusion failure in low pH bathing solutions. These pH-sensitive PVC membranes illustrate a new dimension, not found for other mobile neutral-carrier-based sensors, i.e., Donnan failure produces fixed positive sites that create a nearly ideal anion sensor. The modification of Donnan theory is derived and illustrated using carrier-based and aminated-PVC-based sensors. © 1993.

Publication Title

Analytica Chimica Acta

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