Strontium(II) Sensor Based on a Modified Calix[6]arene in PVC Matrix

5,11,17,23,29,35-Hexakis(1,1,3,3-tetramethylbutyl)-37,38,39,40,41,42-hexakis(carboxy methoxy)calix[6]arene (I) has been evaluated as an ionophore for the analysis of Sr2+. The influences of the nature of the plasticizers (DBA, CN, DOP, NPOE) and of the anion excluder (NaTPB) on the characteristics o...

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Bibliographic Details
Published in:Analytical Sciences 2005, Vol.21(3), pp.293-296
Main Authors: GUPTA, Vinod Kumar, LUDWIG, Rainer, AGARWAL, Shiva
Format: Article
Language:English
Subjects:
Calixarenes - chemistry
Electrodes
Hydrogen-Ion Concentration
Molecular Structure
Polyvinyl Chloride - chemistry
Potentiometry
Strontium - chemistry
Titrimetry
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Summary:5,11,17,23,29,35-Hexakis(1,1,3,3-tetramethylbutyl)-37,38,39,40,41,42-hexakis(carboxy methoxy)calix[6]arene (I) has been evaluated as an ionophore for the analysis of Sr2+. The influences of the nature of the plasticizers (DBA, CN, DOP, NPOE) and of the anion excluder (NaTPB) on the characteristics of the electrode were discussed. The best electrode was fabricated with a membrane having composition 6:150:170:3 (I:PVC:DBA:NaTPB). The response to Sr2+ was Nernstian in the range 1.9 × 10-5 to 1.0 × 10-1 M of Sr2+. The influence of pH has also been studied. The electrode exhibited better potential stability and had an operational lifetime of 4 months. The KA,BPot values showed that other alkaline earth metal ions are well discriminated. The sensor has also been used as an indicator electrode in the potentiometric titration of sodium carbonate with strontium(II) ions.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.21.293