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KMID : 1059520070510040324
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Journal of the Korean Chemical Society
2007 Volume.51 No. 4 p.324 ~ p.330
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A Highly Selective Mercury(II) Ion-Selective Membrane Sensor
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Ali A. Ensafi
S. Meghdadi
Ali R. Allafchian
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Abstract
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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
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KEYWORD
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Bis(benzoylacetone)propylenediimine, Ion selective electrode, PVC, Hg(II)
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