Graphite based solid state polymeric membrane ion-selective...

Details Graphite based solid state polymeric membrane ion-selective... Graphite based solid state polymeric membrane ion-selective...

G - Physics

01

N

G01N 27/333 (2006.01)

Patent

CA 2085322

An improved solid-slate ion-selective electrode has greater uniformity of asymmetric potential and high sensitivity and selectivity for the cation of interest. The electrode comprises: (1) a porous element comprising graphite; (2) an electrochemical reference in substantially dry form on at least a portion of the element, the reference comprising: (a) an oxidant and (b) a reductant that is the conjugate of the oxidant, the oxidant and reductant being present in about equimolar quantities; and (3) a polymeric membrane comprising an ion-selective ionophore in electrochemical contact with the electrochemical reference. The electrode can be prepared to be selective for one of a number of cations, including lithium and ammonium. Methods for preparing these electrodes are also disclosed.

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