Comparative studies of neodymium (III)-selective PVC membrane sensors.

摘要: Abstract Sensors based on two neutral ionophores, N,N′-bis((1H-pyrrol-2-yl)methylene)cyclohexane-1,2-diamine ( L 1 ) and 3,3′-(cyclohexane-1,2-diylbis(azan-1-yl-1-ylidene)bis(methan-1-yl-1-ylidene)bis(5-hydroxymethyl)pyridine-2-ol) 2 are described for quantification of neodymium (III). Effect various plasticizers; 2-nitrophenyloctylether o -NPOE), dibutyl butylphosphonate (DBBP), tri-n-butyl phosphates (TBP), dioctylpthalate (DOP) chloronapthalen (CN) anion excluder, sodiumtetraphenylborate (NaTPB) has been studied. The membrane composition PVC: -NPOE:ionophore ):NaTPB (w/w; mg) 150:300:5:5 exhibited best performance. sensor with ionophore exhibits significantly enhanced selectivity towards (III) in the concentration range 5.0 × 10 −7 to 1.0 × 10 −2  M a detection limit Nernstian compliance (19.8 ± 0.3 mV decade −1 activity) within pH 4.0–8.0. response time was found as 10 s. influence possible interfering ions also investigated properties electrode. fast stable response, good reproducibility long-term stability observed. work satisfactorily partially non-aqueous media up 20% (v/v) content methanol, ethanol or acetonitrile could be used period 3 months. coefficients determined by using fixed interference method (FIM) indicate high neodymium. proposed electrode shows fairly discrimination from other cations. application prepared demonstrated determination spiked water samples.