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-propanediamine)mercury(II) bromide [Hg(BMPPMB)Br2], 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)Br2, 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 microM, 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 < or =5 s and could be used for at least 84, 80, and 100 days for Hg(BMPPMB)Br2, VO(5-Br Salen), and UO2(5-Br Salen), respectively, without any considerable divergence in their potential responses.
Shokrollahi
Ardeshir
A
University of Yasouj, Chemistry Department, Yasouj 75914-353, Iran.
Ghaedi
Mehrorang
M
Kianfar
Ali Hossain
AH
Montazerozohori
Morteza
M
Najibzadeh
Marziyeh
M
D004566:Electrodes; D006108:Graphite; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007454:Iodides / Q000032:analysis*; D007476:Ionophores / Q000032:analysis*; D008567:Membranes, Artificial; D004364:Pharmaceutical Preparations / Q000032:analysis; D011143:Polyvinyl Chloride; D011199:Potentiometry; D013056:Spectrophotometry, Ultraviolet
D007202:Indicators and Reagents; D007454:Iodides; D007476:Ionophores; D008567:Membranes, Artificial; D004364:Pharmaceutical Preparations; D006108:Graphite; D011143:Polyvinyl Chloride