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Determination of Hg (II) in Food Specimens by a Straightforward Potentiometric Sensor Utilizing 5,12-dihydroquinoxalino(2,3-b)quinoxaline as the Ionophore

Document Type : Research Paper

Authors

1 Department of Chemical Engineering-Biotechnology, Science and Research Branch, Islamic Azad University, Tehran, Iran.

2 Department of Food Science and Technology, Tehran Medical Science, Islamic Azad University, Tehran, Iran.

3 Ph.D student of Food Sciences and Industries, Biotechnology Orientation, Islamic Azad University Yasouj Branch, Yasouj,Iran.

Abstract

The research aimed to fabricate a coated graphite membrane electrode for the potentiometric measurement of mercury (II) using 5,12-dihydroquinoxalino(2,3-b)quinoxaline (L) as the ionophore. Density functional theory computations were employed to investigate the interaction of L with 10 different cations, revealing that L exhibited the strongest interaction with Hg (II). The optimized membrane entailed of 30% PVC, 9% L, 2% NaTPB, and 59% nitrobenzene (NB) yielded the best Nernstian response. The designed electrode revealed a broead linearity domain in the concentration range of 1×10-8-1×10-3 mol L-1 with a slope of 31.2±0.3 mV decade-1 and a limit of detection (LOD) of 7.5×10-9 mol L-1. Selectivity testing using the matched potential method showed no significant interference, affirming the sensor's selectivity. The electrode exhibited a rapid response time of 5 seconds and a lifespan of 4 months. Additionally, the potential response of the electrode remained unaffected by solution pH within the range of 3.0-8.0. The impact of organic solvents on the potential response was also evaluated, demonstrating that the sensor kept its Nernstian behavior in solutions with up to 20% non-aqueous content. In addition, the electrode was successfully utilized to determine Hg (II) in edible samples and employed as an indicator electrode in the potentiometric titration of Hg (II).

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International Journal of New Chemistry
Volume 11, Issue 4
March 2024
Pages 393-413
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