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Distribution, Mobility, and Health Risks Assessment of Trace Metals in River Sediments from Intense Agricultural Activity Areas in West Africa

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Journal of Materials Science and Chemical Engineering 2024年第8期12卷 12-42页

作者： Ahbeauriet Ahmed Ouattara Maley-Pacôme Soro albert Brou Kouadio Horo kon. albert Trokourey Dpartment des Sciences et Technique Universit Alassane Ouattara Bouak Cte dIvoire Laboratoire de Thermodynamique et de Physico-Chimie du Milieu Universit Nangui Abrogoua Abidjan Cte dIvoire Laboratoire de Chimie Physique Universit Flix Houphout Boigny Abidjan Cte dIvoire

The economy of West African countries is mainly based on agriculture. However, the trace metal(loid)s contamination status in rivers is relatively unknown in the region. In this work, 45 surface sediments collected from the Bandama, Comoé, and Bia Rivers in south and south eastern Côte d’Ivoire (West Africa), were analyzed for total metal concentrations and chemical speciation. The results showed that the river sediments were considerably contaminated by Cd and moderately contaminated by As, Cu, Pb, and Zn. Significant spatial variations were observed among the stations but not between the rivers. Metals Cd and Cu were likely to cause more ecological risks. The speciation analysis unravelled that the metal(loid)s partitioned mainly in the residual fraction, with the potential mobile fraction varying from 14% to 28%. The study calls for establishment of strict policies relative to the application of fertilizers and agrochemicals and mining activities to protect the environment and human health risks.

关键词： River Sediment Trace Metal (Loid)s Multivariate Analysis Potential Ecological Risk Assessments Sequential Extraction Geochemical Indices

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Kinetic and Thermodynamic Study of the Elimination of Remazol Black on Activated Carbon Based on Ricinodendron heudelotii Shells

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Journal of Materials Science and Chemical Engineering 2023年第9期11卷 1-20页

作者： Kouakou Yao Urbain Kambiré Ollo Eroi N’goran Sévérin kon. Yétchié Tchonrontcha Trokourey albert UFR Sciences et Technologies Université de Man Man C&#244te d’Ivoire Laboratoire de Thermodynamique et Physico-Chimie du Milieu UFR Sciences Fondamentales et Appliquées Université Nangui Abrogoua Abidjan C&#244te d’Ivoire UFR SSMT Laboratoire de Constitution et Réaction de la Matière Université Félix Houphou&#235t-Boigny Abidjan C&#244te d’Ivoire

Activated carbon made from the shells of Ricinodendron heudelotii was used to remove the remazol black dye in aqueous solution. The results of the characterization of this carbon revealed that it is microporous, with a basic global surface (0.337 mmol/L) and a specific surface of 612 m2/g. The prepared carbon therefore has excellent adsorbent properties. Kinetic and thermodynamic studies were carried out to describe the adsorption mechanism of remazol black on this carbon. It appears from this study that the pseudo-second-order kinetic model is the best suited to describe this adsorption phenomenon with an equilibrium time of 200 min. The adsorption equilibrium study revealed that Langmuir and Freundlich models can help to describe the adsorption process. We note that the optimum pH and optimum mass for the removal of 20 mg/L of remazol black are 3 and 0.25 g, respectively. This carbon made it possible to eliminate more than 98% of the remazol dye in aqueous solution. The thermodynamic study revealed that the adsorption is of the physisorption type, spontaneous and endothermic.

关键词： Activated Carbon Ricinodendron heudelotii Dye Removal Optimization Adsorption Isotherm

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Abundance and Source Identification of Polycyclic Aromatic Hydrocarbons in Sediments of the Ivory Coastal Zone (Toukouzou Hozalem-Assinie)

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American Journal of Analytical Chemistry 2023年第1期14卷 12-27页

作者： Laure Emma Oura Vanh Eric-Simon Zran Georges Kouadio Horo kon. Affoué Tindo Sylvie kon.n albert Trokourey Kouassi Benjamin Yao Fofana Bakary Laboratoire des Procédés Industriels de Synthèse de l’Environnement et des Energies Nouvelles (LAPISEN) de l’Institut National Polytechnique Félix Houphouë t Boigny de Yamoussoukro Yamoussoukro C&ocirc te d’Ivoire Centre Analyses et Recherche (CAR) Petroci Holding Abidjan C&ocirc te d’Ivoire Laboratoire de Constitution et Réaction de la Matière (LCRM) Université Félix Houphouet Boigny Abidjan Cote d’Ivoire Department of Science and Technology Université Alassane Ouattara de Bouaké Bouaké C&ocirc te d’Ivoire Laboratoire de Thermodynamique et de Physico Chimie du Milieu Université Nangui Abrogoua Abidjan C&ocirc te d’Ivoire Centre D’Analyse et de Recherche de la PETROCI (DCAR) Cô te d’Ivoire. Immeuble les Hevéas-14 Bd Carde Abidjan Cote d’Ivoire

Polycyclic aromatic hydrocarbons (PAHs) are strongly associated with agricultural, residential, transportation, industrial and petroleum activities. In this study, the presence of PAHs (polycyclic aromatic hydrocarbons) was investigated in sediments of the ivory coastal zone (Toukouzou Hozalem-Assinie). The main objectives of this study were to determine the abundance and to predict the source of PAHs in the sediments. Gas chromatography-mass spectrometry (GC-MS) was used to analyze sixteen priority PAHs. Total PAHs concentrations were from 1.31 to 3992.68 mg/kg in sediment with an average concentration of (307.54 ± 16.10) mg/kg. Among all PAHs, Naphthalene (Nap = 332.72 mg/kg) and Phenanthrene (Phe = 41.75 mg/kg) were found in the highest concentration, whereas Benzo (k) Fluoranthene was found in the least concentration in the range of 0 - 0.85 mg/kg (mean 0.24 mg/kg). Bassam-Modeste Lagune (BML) sampling site was the site with the highest concentration of total PAHs (all 16 PAHs) compared to the others due to their location in a highly populated estuary area that receives commercial, tourism, port, petroleum and heavy industrial activities. Diagnostic ratios were used to determine the sources of PAHs and suggested that the PAH profile in the sediments was dominated by 2 and 3 ring PAHs. The patterns of PAH compounds in sediment indicated that contamination is from mixed sources, with a strong indication of petrogenic contamination potentially from spills of fuel, oil and industrial activities.

关键词： Polycyclic Aromatic Hydrocarbons Sediment Source Abundance Ivorian Coastal

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