Lead selective membrane electrode using cryptand(222) neutral carrier |
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| Authors: | M K Amini M Mazloum and A A Ensafi |
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| Institution: | (1) Chemistry Department, University of Esfahan, Esfahan, 81746, Iran, IR;(2) College of Chemistry, Esfahan University of Technology, Esfahan, Iran, IR |
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| Abstract: | The construction, performance characteristics and applications of a polymeric membrance electrode for lead(II) ion are reported.
The electrode was prepared by incorporating cryptand(222) as the neutral carrier into a plasticized poly(vinyl chloride) membrane.
The influence of membrane composition, pH and concentration of internal reference solution were investigated. The electrode
exhibits a potentiometric response for Pb2+ ion over the concentration range 10–1–10–5 M with a detection limit of 5 × 10–6 M Pb2+. It shows a relatively fast response time of about 30 s and can be used for about two months without any considerable divergence
in potential. The proposed sensor revealed good selectivities for Pb2+ in the presence of several metal ions and could be used in the pH range of 2.5 to 7.5. It was used as an indicator electrode
in the potentiometric titration of Pb2+ with EDTA.
Received: 20 November 1998 / Revised: 26 March 1999 / Accepted: 31 March 1999 |
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