Evaluation of a multifunctional indicator for the electroanalytical determination of nitrite

Exploiting Laser-Induced Graphene Composites as Substrates for Copper-Mediated Nitrate Reduction

“…Electron microscopy was conducted using a Hitachi SU5000 FE-SEM (Hitachi UK, Maidenhead, UK) with an accelerating voltage of 10 kV and a high vacuum pressure of 10 −8 bar. A phloroglucinol spectroscopic assay was employed to detect nitrite byproducts arising from the electro-reduction processes and was prepared as described previously [20]. Water samples were collected from the Tobernalt Holy Well (County Sligo) and Glencar Waterfall (County Leitrim), Ireland.…”

“…In the case of the 20% sample, the peak separation was found to be 60 mV (close to the Nernstian prediction for a oneelectron transfer) [21,22] and stands in marked contrast to that typically observed with both homogenous carbon and composite systems. In such cases, secondary modifications such as electrochemical anodization are normally required to improve performance through defect-induced exfoliation and increased oxygen functionality at the interface [13][14][15][16][17][18][19][20][21][22][23][24][25]. The laser treatment process would appear to achieve this modification at the point at which the carbon is generated and thereby provides a procedurally simple and scalable means of generating highly active electrode surfaces.…”

“…− ) through poising the potential at −1 V and assaying aliquots of the cell solution at various time intervals. Phloroglucinol (1,3,5-trihydroxy-benzene) is known to react with acidified nitrite to yield the corresponding nitroso derivative, which gives rise to a characteristic absorption band at 312 nm [20]. This approach has been used as a sensitive, quantitative assay for nitrite with no interfering response by nitrate or copper ion.…”

Electrocatalytic Oxidation of Nitrite at Gold Nanoparticle‐ polypyrrole Nanowire Modified Glassy Carbon Electrode

“…Numerous methods have been developed for the determination of nitrite, such as ion chromatography, [3][4][5][6] high performance liquid chromatography, [7][8][9] capillary electrophoresis, 10-12 spectrophotometry 13,14 and electrochemical methods. [15][16][17] Although nitrite can be oxidized at conventional electrodes, the oxidation generally requires large overpotentials. Thus, several easily oxidizable compounds always interfere with the determination.…”

Electroreduction of nitrite based on Ag/PPy nanowires modified electrodes

“…Nitrite ions are an essential precursor in the formation of nitrosamines, many of which have been shown tobecarcinogens and harmful in our environment. Therefore, the removal and detection of nitrite in foods, drinking water, industry liquid waste, and electroreduction of nitrite ion to its corresponding reduced form is an important goal for the environmental protection and public health and have gained much attention all the time [1][2][3][4][5][6][7]. But direct electroreduction of nitrite ions requires high overpotential at most bare electrode surfaces.…”