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The lower detection limit of polymeric membrane ion-selective electrodes (ISEs) is impaired by zero-current ion fluxes through the organic phase. This adverse effect is largely eliminated by covalently attaching the ionophore to a polymer backbone. To this purpose, the Pb 2+ -selective ligand, 4-tert-butylcalix[4] arene-tetrakis(N,N'-dimethylthioacetamide) is substituted on its upper...
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