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Thin-layer CVs of a DOS/PVC membrane doped with 5.0 mM ionophore 3, L, and 5.0 mM ionophore 4, L′, in the presence of (A) 50 mM lithium acetate and 5 mM calcium acetate or (B) 50 mM lithium acetate. Potentials are defined against the average peak potential of Li+ transfer. Potential sweep rate, 0.05 V/s.
