Abstract
Potentiometric Pb(Ⅱ) sensors based on oxygen/sulfur functional groups-bearing ionophores,including anthraquinone,aromatic carboxylic acid,carboxylate,phosphate and macrocyclic compounds containing amide or thioamide groups,are systematically summarized.Anthraquinone is found to be quickly responsive ionophores to lead ions with the shortest response time of down to 2 s.Aromatic carboxylic acid with sulfur atom as an ionophore in an asymmetric membrane sensitively responds to lead ions with detection limit of 6.0×10-10 mol/L.Phosphate has advantage of better anti-interference ability with the selective coefficient logK of smaller than 3.0.The macrocyclic amide compound as ionophore has been assembled into microelectrode for sensing confined sample in a 3-μL measuring cell with a superior lower detection limit of 2.7×10-9 mol/L.
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