Voltammetric Determination of 8‐Nitroquinoline Using a Silver Solid Electrode and Its Application to Model Samples of Drinking and River Water

Abstract

This work is focused on the application of a silver solid electrode (AgE) for the development of modern voltammetric methods for the determination of submicromolar concentrations of biologically active compounds present in the environment. 8‐Nitroquinoline (8‐NQ), a well‐known chemical carcinogen, was chosen as a model substance. Differential pulse voltammetry (DPV) was used to study electrochemical behavior of 8‐NQ in different aqueous matrices. The following optimal conditions for determination of 8‐NQ in the concentration ranges from 2 to 100 µmol L−1 were used: BrittonRobinson (BR) buffer of pH 3.0, the regeneration potentials cycles (Ein=−1000 mV, Efin=−100 mV) and constant cleaning potential −2000 mV. Practical applicability of AgE for the determination of micromolar concentrations of 8‐NQ was verified on model samples of drinking and river water.

Substituted Nitroquinolines Immobilized in Multiwalled Carbon Nanotubes: An Unconventional Voltammetric Experiment

“…Based on the possible effect of pH on the voltammetric signals of 5-NQ observed in previous work, [16][17][18][19] the -NO 2 group reduction of the 5-NQ peak (N1 signal) is split into two signals at basic pH values or in aprotic media; i.e., an initial 1-electron reduction step to form the ArNO 2…”

“…14 Nitroquinolines are formed during incomplete combustion of both gasoline and diesel fuel and during the biomass pyrolysis process. 15 The electrochemical reduction of nitroquinolines has been studied with mercury electrodes, 16 silver solid amalgam electrodes, 17 silver solid electrodes, 18 carbon-film electrodes 19 and carbon-fiberrod electrodes. 20 However, to date, the electrochemical behavior of nitroquinolines on carbon nanotubes had not been explored.…”

Oxygen Vacancy-Mediated Reactivity: The Curious Case of Reduction of Nitroquinoline to Aminoquinoline by CuO

“…Nitroquinolines (NQs), such as 5-nitroquinoline (5-NQ) and 8-nitroquinoline (8-NQ), are among the commonly produced industrial byproducts. 1 Discharge of carcinogenic NQs into the ecosystem poses a risk to the health of humans and other life forms. Instead of removal of NQ by filtration or chemical mineralization, 2,3 chemical reduction of NQs to pharmaceutically important aminoquinolines (AQs) is a promising "reuse" approach to address NQ pollution and achieve the net-zero carbon emission target.…”

“…Nitroquinolines (NQs), such as 5-nitroquinoline (5-NQ) and 8-nitroquinoline (8-NQ), are among the commonly produced industrial byproducts . Discharge of carcinogenic NQs into the ecosystem poses a risk to the health of humans and other life forms.…”

Differential pulse voltammetric determination of selected nitrophenols on novel type of porous silver working electrode prepared by powder metallurgy

“…In the framework of systematic search for novel electrode materials suitable for voltammetric determination of environmentally important nitrophenols with the aim to minimize electrode passivation, this paper is devoted to the voltammetric determination of NP, DNP, and TNP as model ecotoxic nitrophenols using a novel type of silver porous electrode (AgPE) prepared by powder metallurgy from silver powder using NH 4 HCO 3 as a space holder and spark plasma sintering method [17]. This research was inspired by interesting results of voltammetric determination of various nitrocompounds using the silver bulk electrode [18,19] with its wide potential window, low noise, commercial availability, nontoxicity, and compatibility with both "green" [20] and "white" [21] analytical chemistry. Another important aim was to minimize electrode passivation which is predominantly caused by oligomer/polymer films formed at electrode surface from radicals generated during the oxidation of the phenolic compound(s) [22].…”