title: Selective uranyl ion detection by polymeric ion-selective electrodes based on salphenH2 derivatives.
abstract: The new ion-selective electrodes (ISEs) based on salphenH2 derivatives such as N,N'-(propylenedioxy)benzenebis(salicylideneimine) L1 and N,N'-4,5-(propylenedioxy)benzenebis(3,5-di-tert-butylsalicylideneimine) L2 as cation carriers are developed for a uranyl ion. The combination of these new ionophores with tris(2-ethylhexyl)phosphate (TEHP) as a plasticizer particularly shows near Nernstian slope in the wide concentration range (1.0 x 10(-6) to 1.0 x 10(-2) M) of UO2(2+) and is observed well in the pH range from 1.0 to 5.0 with a response time less than 20s. Since the employed ionophores were confirmed to form well-defined stable 1:1 complexes with UO2(2+), the observed high selectivity for a uranyl ion over the other cations was attributed to the selective complexation as well as the lipophilic behavior of these ligands especially for L2. The proposed electrodes offered practically low detection limit of 6.5 x 10(-7) M and reasonably good end-points within experimental error were obtained when the sensor was used as an indicator electrode for the potentiometric titration.
authors: Department of Chemistry (BK21) and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, South Korea.
authors: Dong Wan
authors: DW
authors: Kim
authors: Kyeong-Won
authors: KW
authors: Park
authors: Mi-Hyi
authors: MH
authors: Yang
authors: Tae Ho
authors: TH
authors: Kim
authors: Rakesh Kumar
authors: RK
authors: Mahajan
authors: Jae Sang
authors: JS
authors: Kim
mesh_terms: D017736:Ion-Selective Electrodes; D007476:Ionophores / Q000138:chemical synthesis / Q000737:chemistry; D007477:Ions; D015394:Molecular Structure; D010968:Plasticizers / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry; D011199:Potentiometry / Q000295:instrumentation / Q000379:methods; D012459:Salicylates / Q000138:chemical synthesis / Q000737:chemistry; D012680:Sensitivity and Specificity; D014501:Uranium / Q000032:analysis*
chemical_list: D007476:Ionophores; D007477:Ions; D010968:Plasticizers; D011108:Polymers; D012459:Salicylates; C090416:salophen; D014501:Uranium