Abstract
Series of non-cyclic polyether amides were synthesized as derivatives of pyrocatechol. Poly(vinyl chloride) membrane electrodes based on some of these carriers exhibited lithium selectivities over other alkali or alkaline-earth metal ions when dioctyl phenylphosphonate alone or mixed with o-nitrophenyl octyl ether served as plasticizer. Selectivity coefficients for lithium over sodium were up to 2.1 × 10 1, over potassium up to 1.4 × 10 2 and over alkaline-earth metals up to 1.5 × 10 2. The detection limit for lithium was 5.0 × 10 −5 mol dm −3.
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