title: Polymeric membrane sensors based on Cd(II) Schiff base complexes for selective iodide determination in environmental and medicinal samples.
abstract: The two cadmium chelates of schiff bases, N,N'-bis(salicylidene)-1,4-diaminobutane, (Cd-S(1)) and N,N'-bis(salicylidene)-3,4-diaminotoluene (Cd-S(2)), have been synthesized and explored as ionophores for preparing PVC-based membrane sensors selective to iodide(I) ion. Potentiometric investigations indicate high affinity of these receptors for iodide ion. Polyvinyl chloride (PVC)-based membranes of Cd-S(1) and Cd-S(2) using as hexadecyltrimethylammonium bromide (HTAB) cation discriminator and o-nitrophenyloctyl ether (o-NPOE), dibutylphthalate (DBP), acetophenone (AP) and tributylphosphate (TBP) as plasticizing solvent mediators were prepared and investigated as iodide-selective sensors. The best performance was shown by the membrane of composition (w/w) of (Cd-S(1)) (7%):PVC (31%):DBP (60%):HTAB (2%). The sensor works well over a wide concentration range 5.3x10(-7) to 1.0x10(-2)M with Nernstian compliance (59.2mVdecade(-1) of activity) within pH range 2.5-9.0 with a response time of 11s and showed good selectivity for iodide ion over a number of anions. The sensor exhibits adequate life (3 months) with good reproducibility (S.D.+/-0.24mV) and could be used successfully for the determination of iodide content in environmental water samples and mouth wash samples.
authors: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India. akscyfcy@iitr.ernet.in
authors: Ashok Kumar
authors: AK
authors: Singh
authors: Sameena
authors: S
authors: Mehtab
mesh_terms: D002104:Cadmium / Q000737:chemistry*; D002138:Calibration; D004785:Environmental Pollutants / Q000032:analysis*; D007454:Iodides / Q000032:analysis*; D008567:Membranes, Artificial; D009067:Mouthwashes / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D015203:Reproducibility of Results; D012545:Schiff Bases / Q000737:chemistry*; D012680:Sensitivity and Specificity
chemical_list: D004785:Environmental Pollutants; D007454:Iodides; D008567:Membranes, Artificial; D009067:Mouthwashes; D011108:Polymers; D012545:Schiff Bases; D002104:Cadmium