Abstract
A new kind of solid-state contact for potassium ion selective electrode has been investigated. A conductive polymer thin film was electrochemically deposited on a solid electrode surface such as glassy carbon electrode and used as an internal solid contact layer between the solvent polymeric sensing membrane and solid electrode surface. The important parameters of electropolymerization affecting the stability of electromotive force (EMF) response of the solvent polymeric membrane solid-contact sensors are thoroughly studied. The performance of solid-contact sensors based on valinomycin and 2-dodecyl-2-methyl-1,3-propanediyl bis[N-5’-nitro(benzo-15-crown-5)-4’-yl]carbamate (BME-44) ionophores was verified using a wall-jet flow cell system. The designed sensors showed similar electrochemical behavior to conventional ion selective membrane in contact with an internal filling solution. They exhibited excellent selectivity for the primary ion and a linear response over the pK + range 1-5 with a slope of 58 mV.decade -1 . This new generation of this kind of developed sensors showed fast response and relatively high robustness.
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