Abstract
The asymmetric carbonate ion-selective cellulose triacetate membrane electrodes are used to reduce salicylate interference for total CO 2 measurements in human serum samples. The asymmetric membranes are formed by first casting a thin layer of cellulose triacetate without carrier, hydrolyzing one side of this thin film with base, and, subsequently, casting a second layer of cellulose triacetate containing the membrane active components [i.e., (trifluoroacetyl)-p-butylbenzene as a neutral ionophore]. The resulting asymmetric carbonate-selective membranes function equivalently, in terms of the carbonate response, to conventional PVC-based membranes
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