International Journal of New Chemistry
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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

Zohreh Rostami 1
Katayoon Ahangarbahani 1
Maedeh Shadpourian 2
Dorna Abdolkhani 3

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.

https://doi.org/10.22034/ijnc.2024.711993
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).

Keywords

Ion selective electrode
Potentiometry
Mercury
PVC membrane
Sensor
Quinoxaline
Subjects
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International Journal of New Chemistry
Volume 11, Issue 4
Winter 2024
Pages 393-413

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