Abstract
New plasticized PVC membranes iodide selective electrodes have been prepared by incorporating bis(trans-cinnamaldehyde)1,3-propanediimine zinc(II) chloride [ZnLCl2] and bis(trans-cinnamaldehyde) 1,3-propandiimine cadmium(II) chloride [CdLCl2] on the surface of graphite disk electrodes. At optimum value of variables the proposed electrodes have selective response to iodide with respect to a number of inorganic and organic anions with near-Nernstian slopes of −60±1.9 and −58.5±1.9mV/decade of iodide concentration over the range 1.0×10−6–1.0×10−1M with detection limits of 4.0×10−7 and 3.0×10−7M for the electrodes based on [ZnLCl2] and [CdLCl2], respectively. The electrodes based on both ionophores have response times of about (6s), with stable reproducible response during 2months, while their responses is independent of pH over the range 2.5–10.5. The proposed electrodes successfully have been applied for evaluation of iodide ion content in real samples with complicated matrices including water and pharmaceutical samples.
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