Carbonate selective membrane and electrode

Chemistry: electrical and wave energy – Apparatus – Electrolytic

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204 1T, G01N 2746

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active

048103519

ABSTRACT:
The carbonate ion selective membrane of the invention comprises (a) a polymeric inert support material; (b) a plasticizer effective to solubilize the support material; (c) a quaternary ammonium ion; (d) an ionophore which is preferentially reactive with carbonate ions; and (e) a hydrophobic molecule effective to exclude ions other than carbonate ions. The addition of a hydrophobic molecule to the membrane formulation serves two purposes. First, it assists in the "binding" of the organic constituents to the matrix. Second, it repels charged species, i.e., anions and cations, from the solution phase, thereby improving selectivity to the carbonate species which enters the membrane via selective complexation with the ionophore. The quaternary ammonium ion is preferably a C.sub.7 to C.sub.9 quaternary ammonium ion. In this case, the plasticizer is selected to be one effective to maximize the binding of carbonate ions with the C.sub.7 C.sub.9 quaternary ammonium ions. The invention further provides a carbonate ion selective electrode comprising an internal reference element in electrochemical contact with the membrane described above.

REFERENCES:
patent: 3706649 (1972-12-01), Cosgrove et al.
patent: 3723281 (1973-03-01), Wise
patent: 3898147 (1975-08-01), Niedrach
patent: 4214968 (1980-07-01), Battaglia et al.
patent: 4272328 (1981-06-01), Kim et al.
patent: 4303408 (1981-12-01), Kim et al.
Analytic Chimica Acta, 76: pp. 155-164 (1975).
Greenberg et al, Analytica Chimca Acta, 141, pp. 57-64 (1982).
Analytical Chemistry, 54, pp. 423-429 (1982).
Analytical Chemistry, 53, pp. 588-593 (1981).

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