Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India.
Anal Chim Acta. 2010 Nov 29;681(1-2):27-32. doi: 10.1016/j.aca.2010.09.037. Epub 2010 Oct 1.
This is a first promethium(145) ion-selective sensor based on the comparative study of two Schiff base ligands (X(1) and X(2)) as neutral ionophores. Effect of various plasticizers: 2-nitrophenyloctylether (o-NPOE), dibutyl phosphonate (DBP), dioctylphthalate (DOP), tri-(2-ethylhexyl) phosphate (TEHP), dibutyl butylphosphonate (DBBP), chloronaphthalene (CN) and anion excluders: potassium tetrakis (p-chloropheny1) borate (KTpClPB), sodiumtetraphenylborate (NaTPB) and oleic acid (OA) have been studied. The membrane with a composition of ionophore (X(1)/X(2)):KTpClPB:PVC:o-NPOE (w/w, %) in the ratio of 5:5:30:60 exhibited best performance. The best responsive membrane sensors (8 and 21) exhibited working concentration range of 4.5×10(-7)-1.0×10(-2) M and 3.5×10(-6)-1.0×10(-2) M with a detection limits of 3.2×10(-7) M and 2.3×10(-6) M and Nernstian slopes of 20.0±0.5, 19.5±0.5 mV decade(-1) of activity, respectively. The sensor no. 8 works satisfactorily in partially non-aqueous media up to 10% (v/v) content of methanol, ethanol and acetonitrile. Analytical application of the proposed sensor has been demonstrated in determination of promethium (III) ions in spiked water samples.
这是第一个基于两种希夫碱配体（X(1)和 X(2)）作为中性离子载体的比较研究的镎（145）离子选择性传感器。研究了各种增塑剂：2-硝基苯辛醚（o-NPOE）、二丁基膦酸酯（DBP）、邻苯二甲酸二辛酯（DOP）、三（2-乙基己基）磷酸酯（TEHP）、二丁基丁基膦酸酯（DBBP）、氯萘（CN）和阴离子排斥剂：四（对氯苯基）硼酸钾（KTpClPB）、四苯硼酸钠（NaTPB）和油酸（OA）的影响。具有离子载体（X(1)/X(2)）：KTpClPB：PVC：o-NPOE（w/w，%）比例为 5:5:30:60 的膜具有最佳性能。最佳响应膜传感器（8 和 21）的工作浓度范围分别为 4.5×10(-7)-1.0×10(-2) M 和 3.5×10(-6)-1.0×10(-2) M，检测限分别为 3.2×10(-7) M 和 2.3×10(-6) M，活度的 Nernst 斜率分别为 20.0±0.5、19.5±0.5 mV decade(-1)。传感器 8 在高达 10%（v/v）甲醇、乙醇和乙腈的部分非水介质中能良好工作。该传感器已成功用于测定加标水样中的镎（III）离子。
