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Detection of Oxidants Such as Hydroxyl Radicals and Chlorine Electrogenerated on a BDD Electrode by Simple Methods

Advances in Chemical Engineering and Science 2024年第4期14卷 173-187页

作者： Konan Sylvestre Koffi Konan Martin Koffi Foffié Thiery Auguste Appia sahi placide sadia Kouakou Jocelin Kimou Souleymane Kone Lassiné Ouattara Laboratoire de Constitution et de Raction de la Matire UFR SSMT Universit Flix Houphout Boiguy Abidjan Cte dIvoire UFR Environnement Universit Jean Lorougnon Gud Daloa Cte dIvoire

The aim of this work is to detect electrogenerated hydroxyl radicals and chlorine by simple and less expensive methods. Preparative electrolyses of perchloric acid (HClO4) and sodium chloride (NaCl) were performed on a boron-doped diamond (BDD) electrode. The hydroxyl radicals were quantified indirectly by assaying the samples from the HClO4 (0.1 M) electrolysis with a 10−4 M potassium permanganate solution. The investigations showed that the amount of hydroxyl radicals depends on the concentration of HClO4 and the current density. As for chlorine, a qualitative determination was carried out. A mixture of the electrolyte solution of HClO4 (0.1 M) + NaI (0.2 M) + 2 mL of hexane, taken in this order, leads to a purplish-pink coloration attesting to the presence of Cl2. The same test was carried out with NaBr and NaI giving pale and very pale pink colourations, respectively, showing that the intensity of the colouration depends on the strength of the oxidant present. In addition, oxidants were detected during the electrooxidation of metronidazole (MNZ). The results showed the participation of electrogenerated hydroxyl radicals. The generation of chlorine has also been proven. Furthermore, the degradation leads to a chemical oxygen demand (COD) removal rate of 83.48% and the process is diffusion-controlled.

关键词： Electrooxidation Hydroxyl Radicals Chlorine Detection

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Differential Pulse Voltammetric Simultaneous Determination of Paracetamol and Omnipaque on Boron Doped Diamond Electrode: Application to Natural Tomato, Carrot, Cucumber Juices and Wastewater

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American Journal of Analytical Chemistry 2023年第10期14卷 434-450页

作者： Koffi Konan Martin sadia sahi placide Kouadio Brou Albert Gnamba Corneil Quand-Même Fofié Thiery Auguste Appia Koffi Konan Sylvestre Lassiné Ouattara UFR Environnement Université Jean Lorougnon Guédé Daloa C&ocircte d’Ivoire UFR Sciences et Technologies Université Alassane Ouattara Bouaké C&ocircte d’Ivoire Laboratoire de constitution et de réaction de la matière UFR SSMT Université Félix Houphouet Boiguy Abidjan C&ocircte d’Ivoire

This article describes the use of a boron-doped diamond electrode (BDDE) as an electrochemical sensor for the simultaneous determination of omnipaque (OMP) and paracetamol (PCM) in perchloric acid medium (HClO4 0.1 M) and in complex matrices such as tomato, carrot and cucumber juices and waste water from the Treichville University Hospital. Voltammetric studies allowed us to have well-defined oxidation peaks at distinct potentials of OMP (E = 0.5 V/SCE) and PCM (E = 0.7 V/SCE). Under optimized conditions, well-defined quantities of OMP and PCM, introduced simultaneously by metered additions, gave linear responses in concentration ranges of 259.8 - 467.2 μM for OMP and 58.73 - 116.3 μM PCM. The detection limits obtained are 7.23 μΜ and 3.6 μΜ respectively for OMP and PCM with recovery rates between 85.8% ± 0.1% and 92.6% ± 0.1% for OMP and between 99.9% ± 0.1% and 101.2% ± 0.4% for the PCM. This technique has been successfully used to simultaneously detect these pharmaceuticals in these complex environments. It allows recovery of OMP and PCM respectively up to 97.5% ± 0.0% and 91.6% ± 0.3% in tomato juice;100.0% ± 0.0% and 95.2% ± 0.2% in carrot juice;101.4% ± 0.1% and 97.3% ± 0.3% in cucumber juice;100.1% ± 0.9% and 100.9% ± 0.1% in wastewater. The relevance of this technique for the simultaneous detection of OMP and PCM in tomato, carrot, cucumber juices and in waste water can be studied in the context of the contamination of certain fruits and vegetables by the substances organic pharmaceuticals released into the environment without prior treatment.

关键词： Omnipaque Paracétamol Differential Pulse Voltammetry Boron Doped Diamond Electrode

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Assessment of the Physicochemical and Microbiological Parameters of a Teaching Hospital’s Wastewaters in Abidjan in Côte d’Ivoire

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Journal of Water Resource and Protection 2016年第13期8卷 1251-1265页

作者： sadia sahi placide Berté Mohamed Loba Evelyne Marie Hélène Appia Foffié Thiéry Auguste Gnamba Corneil Quand-Meme Ibrahima Sanogo Lassiné Ouattara Laboratoire de Chimie Physique UFR SSMT Université Félix Houphou&#235t-Boigny de Cocody Abidjan C&#244te d’Ivoire Centre Hospitalier Universitaire (CHU Treichville) de Treichville Abidjan C&#244te d’Ivoire

This work deals with the physicochemical and microbiological characterization of a hospital wastewater that is directly discharged in water bodies without treatment. Our focus was paid on the teaching hospital of Treichville (Cote d’Ivoire). For the purpose, various physicochemical parameters such as temperature, pH, dissolved oxygen, total dissolved solid, conductivity, nitrate, phosphate, chloride, chemical oxygen demand (COD), biological oxygen demand for five days (BOD5), salinity, and total suspended solids have been assessed. For the microbiological investigations, the parameters consisting in Pseudomonas aeruginosa, Salmonella and total coliforms have been assessed. From the analysis, it has been found that the wastewaters of the teaching hospital of Treichville are highly loaded in organic pollutants and in pathogens bacteria. The values of nitrate, dissolved oxygen demand, COD, BOD5 and biological parameters do not respect the international (WHO) values recommended for the water to be discharged in the environment. The ratio COD/BOD5 has been determined to vary between 1.25 and 2.80. The results showed that the studied wastewater is a domestic type wastewater composed either by mostly biodegradable pollutants or a mixture of biodegradable and non-biodegradable organic pollutants. These wastewaters constitute therefore a risk for the populations since they are discharged in water bodies without any treatment and used by communities.

关键词： Physicochemical Parameter Chemical Oxygen Demand Hospital Wastewater Pseudomonas aeruginosa Salmonella

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