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Selective and simultaneous electrochemical detection of nitrite and nitrate ions using Ag-MOF: Food and water
Chelladurai Arul1, Ganesan Veerapandi1, Chinnathambi Sekar1
1Department of Bioelectronics and Biosensors, Alagappa University, Karaikudi 630 003, Tamilnadu, India.
Abstract:
We report the synthesis of metal organic framework (MOF) based on Ag and phenylenediamine (C6H4(NH2)2) and its application for detection of both nitrites and nitrates. Ag-MOF modified glassy carbon electrode (GCE) revealed a significantly higher electrocatalytic activity towards selective oxidation of NO2- and reduction of NO3- over wider concentration ranges of 4-4040 μmol/L and 20-4750 μmol/L respectively and the corresponding lowest detection limits have been deduced as 0.045 μmol/L and 12 μmol/L. Interestingly, cyclic voltammetric measurements at Ag-MOF/GCE in phosphate buffer saline (pH 5.0) exhibited both anodic (NO2-) and cathodic (NO3-) peaks indicating the possibility for simultaneous detection of the two nitrogen compounds. Further, the fabricated electrode has been successfully used to determine NO2- and NO3- concentrations in beetroot, spinach, canned chicken and pond water with excellent relative standard deviation (RSD) values and recovery percentages. The results suggest the potential application of the fabricated sensor for food and environmental analyses.
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