Construction of New Iodide Ion-Selective Electrodes Based on New Ionophores: Comparison of the Effect of Structures and Additives on Electrode Response

New iodide ion-selective electrodes based on bis(2-methyl-3-phenyl-propenylidene)1,2-propane-diamine)mercury(II) bromide [Hg(BMPPMB)Br-2], bis (5-bromo salicylaldehyde) ethylenediimine vanadyl(IV) [VO(5-Br Salen)], and bis(5-bromo salicylaldehyde) ethylenediimine uranyl(VI) [UO2(5-Br Salen)] carriers are described. The electrodes exhibited Nernstian slopes of -58.3 +/- 1.0,-58.5 +/- 1.4, and -59.0 +/- 1.2 mV/decade for Hg(BMPPMB)Br-2, VO(5-Br Salen), and UO2(5-Br Salen) iodide ion concentration in the range of 1.0 x 10(-6)-0.1 M, with detection limits of about 0.6, 0.5, and 0.3 mu M, respectively. The potentiometric responses of the electrodes were independent of pH over the range 1.7-10.6, 2.2-11.3, and 2.1-11.1, with satisfactory reproducibility. The electrodes had response times of <= 5 s and could be used for at least 84, 80, and 100 days for Hg(BMPPMB)Br-2, VO(5-Br Salen), and UO2(5-Br Salen), respectively, without any considerable divergence in their potential responses.