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http://dx.doi.org/10.5012/jkcs.2007.51.4.324

A Highly Selective Mercury(II) Ion-Selective Membrane Sensor  

Ensafi, Ali A. (College of Chemistry, Isfahan University of Technology)
Meghdadi, S. (College of Chemistry, Isfahan University of Technology)
Allafchian, Ali R. (College of Chemistry, Isfahan University of Technology)
Publication Information
Journal of the Korean Chemical Society / v.51, no.4, 2007 , pp. 324-330 More about this Journal
Abstract
A new ion selective PVC membrane electrode is developed as a sensor for mercury(II) ions based on bis(benzoylacetone) propylenediimine (H2(BA)2PD) as an ionophore. The electrode shows good response characteristics and displays, a linear Emf vs. log[Hg2+] response over the concentration range of 1.0×10-6 to 1.0×10-1 M Hg(II) with a Nernstian slope of 29.8±0.75 mV per decade and with a detection limit of 2.2×10-7 M Hg(II) over the pH range of 2.5-11.5. Selectivity concentrations for Hg(II) relative to a number of potential interfering ions were also investigated. The sensor is highly selective for Hg(II) ions over a large number of cations with different charge. The sensor has been found to be chemically inert showing a fast response time of 60 s and was used over a period of 3 months with a good reproducibility (S = 0.27 mV). The electrode was successfully applied to determine mercury(II) in real samples with satisfactory results.
Keywords
Bis(benzoylacetone)propylenediimine; Ion selective electrode; PVC; Hg(II);
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