| http://www.w3.org/ns/prov#value | - One aspect of the invention is an electrode or gradient polymer as disclosed herein, wherein the maximum concentration of ionophore in the membrane region is 0.1 to 20%, 0.1 to 10%, 0.1 to 9%, 0.1 to 8%, 0.1 to 7%, 0.1 to 6%, 0.1 to 5%, 0.1 to 4%, 0.1 to 3%, 0.1 to 2%, 0.1 to 1%, and is preferably 1%, most preferably 1 to 2% ionophore.
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