Design and Evaluation of a Mercury (II) Optode Based on Immobilization of 1-(2-Pyridylazo)-2-Naphthol on a Triacetylcellulose Membrane and Determination in Various Samples
 
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Payame Noor University PNU, Shiraz, 71365-944, Iran
Online publication date: 2008-11-01
Publication date: 2008-11-01
 
Eurasian J Anal Chem 2008;3(3):284–297
 
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ABSTRACT
The characterization of an optical sensor membrane is described for the determination of Hg2+ ions based on the immobilization of 1-(2-pyridylazo)-2-naphthol (PAN) on a triacetylcellulose membrane. The membrane responds to mercury ions by changing color reversibly from orange to red in universal buffer solution at pH 6. Under optimum conditions, the proposed membrane displayed a linear range of 0.1-24 μg mL-1 with a limit of detection of, 0.02 μg mL-1 at a wavelength of 558 nm. The response time of the optode was about 10-12 min, depending on the concentration of mercury (II) ions. The coefficients of variation (CV) of the sensor response for, 1.0 μg mL-1 of Hg (II) was, 1.8% and the CV between seven membranes was 2.3%. The sensor can readily be regenerated with the ethylene diamine solution. The optode is fully reversible and the selectivity of optode to Hg2+ ions in universal buffer is relatively good with Co2+ and Ni2+ ions as interferences. The proposed optode was applied successfully for the determination of mercury (II) in various samples.
 
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