Abstract
Abstract A new 14-membered macrocyclic ligand containing nitrogen donor atoms was prepared and characterized. The macrocycle behaves as a selective chelating ion exchanger for some metal ions. The PVC-based membrane electrode of the macrocycle shows a Nernstian response for nickel(II) ions over a wide concentration range (0.294 to 58.69 × 102 mg dm−3) between pH 3.0 to 7.0. The electrode is found to possess adequate stability and specific selectivity with a response time of 10 s. The sensor can also be used in a partially nonaqueous medium having a 35% (v/v) nonaqueous content. The membrane exhibits excellent selectivity for nickel(II) ions, and no disturbance is observed by normal interferents like Cu2+, Cd2+, Co2+, Pb2+, Zn2+, Mg2+, and Hg2+ ions. The electrode has been successfully used for estimating Ni2+ ions in milk powders, chocolates, and hydrogenated vegetable oils. Small amounts (≤5.0 × 10−5 mol dm−3) of hexadecyltrimethylammonium bromide do not disturb the functioning of the membrane sensor.
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