Abstract
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.
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