Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1992-01-15
1994-02-15
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204416, G01N 27414
Patent
active
052863654
ABSTRACT:
An improved solid-state 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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Beckman Instruments Inc.
Farber Michael B.
Hampson Gary T.
May William H.
Tung T.
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