Selective uranyl ion detection by polymeric ion-selective electrodes based on salphenH2 derivatives.
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.
Kim
Dong Wan
DW
Department of Chemistry (BK21) and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, South Korea.
Park
Kyeong-Won
KW
Yang
Mi-Hyi
MH
Kim
Tae Ho
TH
Mahajan
Rakesh Kumar
RK
Kim
Jae Sang
JS
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*
D007476:Ionophores; D007477:Ions; D010968:Plasticizers; D011108:Polymers; D012459:Salicylates; C090416:salophen; D014501:Uranium