Document Detail


Nano-level monitoring of Yb(III) by fabrication of coated graphite electrode based on newly synthesized hexaaza macrocyclic ligand.
MedLine Citation:
PMID:  19446066     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The two macrocyclic ligands 2,12-(2-methoxyaniline)2-4,14-Me2-[20]-1,4,11,14-tetraene-1,5,8,11,15,18-N6 (L1) and 2,12-(2-methoxyaniline)(2)-4,14-Me2-8,18-dimethylacrylate-[20]-1,4,11,14-tetraene-1,5,8,11,15,18-N6 (L2) have been synthesized and explored as neutral ionophores for preparing poly(vinylchloride) (PVC) based membrane sensors selective to Yb(III) ions. Effects of various plasticizers and anion excluders were studied in detail and improved performance was observed. The best performance was obtained for the membrane sensor having a composition of L2:PVC:BA:NaTPB in the ratio of 5: 40: 52: 3 (w/w; mg). The performance of the membrane based on L2 was compared with polymeric membrane electrode (PME) as well as with coated graphite electrode (CGE). The electrodes exhibit Nernstian slope for Yb3+ ions with limits of detection of 4.3 x 10(-8) M for PME and 5.8 x 10(-9) M for CGE. The response time for PME and CGE was found to be 10 s and 8 s, respectively. The potentiometric responses are independent of the pH of the test solution in the pH range 3.0-8.0 for PME and 2.5-8.5 for CGE. The CGE has found to work satisfactorily in partially non-aqueous media upto 30% (v/v) content of methanol, ethanol and 20% (v/v) content of acetonitrile and could be used for a period of 5 months. The CGE was used as indicator electrode in the potentiometric titration of Yb3+ ions with EDTA and in determination of fluoride ions in mouthwash samples. It can be used for determination of sulfite in red and white wine samples and also in determination of Yb3+ in various binary mixtures with quantitative results.
Authors:
Ashok K Singh; Prerna Singh
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Publication Detail:
Type:  Journal Article     Date:  2009-04-05
Journal Detail:
Title:  Analytica chimica acta     Volume:  643     ISSN:  1873-4324     ISO Abbreviation:  Anal. Chim. Acta     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-05-18     Completed Date:  2009-07-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370534     Medline TA:  Anal Chim Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  74-82     Citation Subset:  -    
Affiliation:
Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India. akscyfcy@iitr.ernet.in
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