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Study of Formic and Acetic Acids in the Air of Humid Savannah Case of lamto (Côte d’Ivoire)

Atmospheric and Climate Sciences 2016年第2期6卷 254-266页

作者： p.lèmayo raoul touré Georges Kouame Kouadio Urbain Kouakou Koffi Charles Romaric Beugré laboratory of Atmospheric physics and Fluid Mechanics (lApA-MF) Félix Houphou&#235t-Boigny University Abidjan C&#244te d’Ivoire physcal Science laboratory of the Ecole Normale Supérieure of Abidjan (ENS) Abidjan C&#244te d’ivoire laboratory of physical chemistry Félix Houphou&#235t-Boigny University Abidjan C&#244te d’Ivoire

From January 1995 to December 2004, 860 rainwater samples were collected in the humid savannah of lamto. Using the Henry’s law, we determined the content of formic and acetic acids in the air based on their concentrations in rainwater. The annual partial pressure of both formic and acetic acids over the decade is variable. It covers a range of 0.003 (1998) to 0.21 ppbv (1996) and 0.27 (1999) to 0.47 ppbv (1996) for formic and acetic acids respectively. Also, the partial pressure in the dry season is higher than that in the wet season. This difference is related to the enrichment of the organic acid content in the air by the various sources that produce these acids. One of the main sources of increment in organic acid is biomass burning. This biomass burning contributes between 21% and 51% to the formation of the two acids in the humid savannah of lamto. Ultimately the average annual organic acidity varies from 40% to 60% over the ten years period.

关键词： Formic Acid Acetic Acid Organic Acidity Biomass Burning

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Assessment of Groundwater physico-Chemical Quality in the Ouémé Delta (Southern-Benin)

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Journal of Environmental protection 2024年第3期15卷 298-317页

作者： Aoulatou Alassane Zakari Dadja Toyou Masamaéya Gnazou Abdoukarim Alassane Kodjo Ap.lete raoul Kpegli Ousmane touré Boukari Bio Guidah Chabi Bénito Didier Koukpohounsi Daouda Mama laboratory of Ap.lied Hydrology National Water Institute University of Abomey-Calavi Benin (LHA/INE/UAC) Cotonou B&eacutenin International Chair in Mathematical physics and Ap.lications (ICMpA—UNESCO Chair) Cotonou B&eacutenin laboratory of Ap.lied Hydrology and Environment Faculty of Sciences University of Lom&eacute Togo (LHAE/FDS/UL) Lom&eacute Togo

Groundwater resources are the main sources of water used to sup.ly drinking water to the pop.lation of the Ouémé Delta via the Continental Terminal aquifer. Urbanization, pop.lation growth, and agricultural and industrial activities have resulted in a deterioration in the quality of these resources. To assess the quality of the delta’s groundwater and its suitability for human consumption and irrigation, a total of fourteen (14) physico-chemical parameters were analyzed in some forty existing water points between September 2020 and March 2021, using standard water analysis techniques. The values obtained were compared with the potability standards recommended by the World Health Organization (WHO) and the Republic of Benin and were subjected to statistical analysis (princip.l component analysis (pCA)). In addition, methods for determining the suitability of water for irrigation were used. The results showed that the waters are acidic to slightly neutral and influenced by ambient temperature. In addition, the waters are moderately mineralized, with conductivities (24 - 1205 μS/cm) in line with WHO standards. A comparison of the analytical results of the WHO (2017) and Benin (2001) standards indicates that the majority of the waters studied are of good quality for all the chemical parameters considered. Nevertheless, some samples show levels of nitrates (21%), potassium (14% to 16%), calcium (13%), ammonium (12%), nitrites (8%) and bicarbonates (10%) over their respective standards. The Wilcox and Riverside diagrams indicate that the majority of waters (90%) have excellent suitability for irrigation and no negative effect on soil fertilization.

关键词： Benin OuéméDelta Groundwater physico-Chemical Quality Consumption Irrigation

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