Reversible pH-independent optical potassium sensor with lipophilic solvatochromic dye transducer on surface modified microporous nylon

Abstract

A reversible and pH-independent fluorescent ion optode is introduced with an ionophore and surface confined solvatochromic dye transducer doped onto microporous nylon membranes. The resulting film responds to K⁺ with excellent selectivity over the range of 10⁻⁷ to 10⁻² M and a response time of t₉₅ < 60 s above 10⁻⁶ M.