Carbonate selective membrane and electrode

Details Carbonate selective membrane and electrode Carbonate selective membrane and electrode

G - Physics

01

N

18/14, 324/23

G01N 27/30 (2006.01) G01N 27/333 (2006.01)

Patent

CA 1272860

ABSTRACT The carbonate ion selective membrane of the invention com- prises (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 hydro- phobic 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 C7 to C9 quaternary ammonium ion. In this case, the plasticizer is selected to be one effective to maximize the binding of carbonate ions with the C7 to C9 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.

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