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Geochemical Analysis of Albian-Maastrichtian Formations in the Offshore Basin of the Abidjan Margin: Rock-Eval Pyrolysis Study

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Open Journal of Geology 2024年第8期14卷 805-822页

作者： n’Guessan Donald Ahoure Blandine Akissi Egoran guy richard n’dri kouadio Zokagon Sylvain Sehi Emmanuelle Laure Oura Zéli Bruno Digbehi UFR of Sciences and Technologies Alassane Ouattara Bouak Laboratory of Plant Biology and Earth Sciences Bouak Cte dIvoire UFR Marine Sciences San Pedro University San Pedro Cte dIvoire PETROCI Geochimistry Department at the Center for Analysis and Research Abidjan Cte dIvoire UFR/STRM Felix Houphout Boigny University of Abidjan Abidjan Cte dIvoire

The Albian-Maastrichtian interval of the Ivorian sedimentary basin has been the subject of numerous sedimentological, biostratigraphic, and geophysical studies. However, its geochemical characteristics remain relatively unexplored. This study aims to determine the oil potential and the nature of the organic matter it contains. It focuses on the geochemical analysis (physicochemical method) of two oil wells located in the offshore sedimentary basin of Côte d’Ivoire, specifically in the Abidjan margin. A total of 154 cuttings samples from wells TMH-1X and TMH-2X were analyzed to determine their oil potential and the nature of the organic matter (OM) they contain. The analyses were performed using Rock-Eval pyrolysis, a method that characterizes the amount of hydrocarbons generated by the organic matter present in the rocks. The key parameters measured include Total Organic Carbon (TOC), Hydrogen Index (HI), oil potential (S2), and maximum pyrolysis temperature (Tmax). These parameters are used to assess the amount of organic matter, its thermal maturity, and its potential to generate hydrocarbons in the studied wells. The results show significant variations between different stratigraphic levels. In well TMH-1X, the Cenomanian and Campanian intervals stand out with very good quantities of organic matter (OM) with good oil potential, although often immature. In contrast, other stages such as the Albian and Turonian contain organic matter in moderate to low quantities, often immature and of continental type, which limits their capacity to generate hydrocarbons. In well TMH-2X, a similar trend is observed. Despite an abundance of organic matter, the oil potential remains low in most of the studied stages. The organic matter is primarily of type III (continental origin) and thermally immature, indicating a low potential for hydrocarbon generation. The study reveals that, although some intervals exhibit high-quality organic matter, the majority of the samples show insuffic

关键词： Geochemistry Rock-Eval Pyrolysis Upper Senonian Petroleum Potential Côte d’Ivoire

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Response of the Maize Variety EV87-28 to a Fertilization Strategy Involving Indorama Granular Urea on Ferralsol in the Central Ivory Coast

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Agricultural Sciences 2024年第1期15卷 187-208页

作者： Fernand guy Yao kouadio Amani Brou Kouame Jean Lopez Essehi Brahima Kone kouadio Houphouet Cheikh Ahmed Diawara Bala Mamadou Ouattara Albert Yao-Kouame Central Laboratory Soils Water and Plants (LCSEP) National Agricultural Research Center (CNRA) Bouaké Ivory Coast Soil Water and Geomaterials Sciences Laboratory (LS2EG) Earth Sciences and Mining Resources Training and Research Unit (UFR STRM) University Félix Houphou&#235t-Boigny of Cocody-Abidjan Abidjan Ivory Coast Cotton Research Station National Agricultural Research Center (CNRA) Bouaké Ivory Coast Food Crops Research Station National Agricultural Research Center (CNRA) Bouaké Ivory Coast Department of Geography Unit of Training and Research (UFR) Communication Environment and Society University Alassane Ouattara Bouaké Ivory Coast

In Côte d’Ivoire, the decline in soil fertility strongly impacts the productivity of maize (Zea mays L.) on heavily leached ferralitic soil. In this study, the general objective was therefore to improve the productivity of maize EV87-28 on the Ferralsols in pre-forested areas during different cropping seasons. Eight (8) micro-plots were set up according to a total randomization device with three repetitions. Two factors were studied: nitrogen fertilizer modalities (main factor) and crop season (secondary factor). Growth, flowering and yield parameters were measured and analyzed. The results showed that there was no interaction between the nitrogen fertilizer factor and the cropping season factor. In addition, this study showed the short rainy season had the most positive impact on growth, flowering and yield parameters than the long rainy season. The results also showed that the different nitrogen fertilizer modalities had no statistically different effects on growth, flowering and yield parameters. However, quantitative differences were reported, highlighting one nitrogen fertilizer modality, which is the combination of urea granule + farm manure (75% urea indorama granules and 25% farm manure). The combination of urea granule + farm manure (75% urea indorama granules and 25% farm manure) had the best effect on corn grain yield. So, the combination of urea (75%) and manure (25%), that resulted in yield gain, could be recommended for corn fertilization during the small rainy season.

关键词： Indorama Granular Urea Ferralsol Cultural Seasons Maize Ivory Coast

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Effects of Calcium and Magnesium on Phosphorus Availability in Ferralsols and Rice Production in Forest Zones of Côte d’Ivoire

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Journal of Agricultural Chemistry and Environment 2024年第1期13卷 33-53页

作者： guy Fernand Yao Brahima Kone kouadio Amani Franck Michaël Lemonou Bahan Jean Lopez Essehi Brou Kouame François Lompo Albert Yao-Kouame national Center for Agronomic Research (CnRA) Central Laboratory Soils Water and Plants (LCSEP) Sustainable Soil and Water Management Program Bouaké C&ocircte d’Ivoire Soil Water and Geomaterials Sciences Laboratory (LS2EG) Earth Sciences and Mining Resources Training and Research Unit (UFR STRM) Félix Houphou&eumlt-Boigny University Abidjan C&ocircte d’Ivoire national Center for Agronomic Research (CnRA) Man Research Station Rice Program Man C&ocircte d’Ivoire Environment and Agricultural Research Institute (InERA) Ouagadougou Burkina Faso

Phosphorus bioavailability has long been a recurring problem in tropical acid soils. A pot experiment was carried out during three (3) successive rice production cycles at Adiopodoumé to evaluate the response of the nERICA 5 rice accession to various doses of calcium, magnesium and phosphorous. The experiment was conducted using a randomized split-plot design. The interactive effects of calcium carbonate (0, 25, 50 and 75 kg·Ca·ha-1) and magnesium sulfate (0, 25, 50 and 75 kg·Mg·ha-1) and Togo natural phosphate (0, 25, 50 and 75 kg·P·ha-1) were determined at each production cycle. The results showed that single-dose natural phosphate supplementation for three cropping cycles resulted in an average enrichment of around 2 mg·P·kg-1 after each trial following its continuous dissolution, with an increase in DSP (33.31% to 70.52%). The study revealed one strategy for managing and enhancing native P with cations and another for exogenous P: there would be a synergy of Ca/Mg on native P, whereas an antagonism would characterize the two parameters in phosphate fertilization.

关键词： Soil Acidity native and Exogenous Phosphorus Free Iron Ca/Mg Balances Rice Growing Côte d’Ivoire

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Contribution of GIS to Soil Landscape Mapping by Multi-Criteria Analysis Using Weighting: The Case of the Square Degrees of M’Bahiakro (Centre) and Daloa (Centre-West) in Ivory Coast

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Open Journal of Geology 2024年第1期14卷 101-116页

作者： guy Fernand Yao Derving Baka nestor Kouman Yao Kouakou Bala Mamadou Ouattara kouadio Amani Jean Lopez Essehi Brou Kouame Albert Yao-Kouame Sustainable Soil Management and Water Control Program Central Laboratory Soils Water and Plants (LCSEP) National Agricultural Research Center (CNRA) Bouaké Ivory Coast Department of Soil Sciences Training and Research Unit for Earth Sciences and Mining Resources (UFR STRM) University Félix Houphou&#235t-Boigny of Cocody-Abidjan Abidjan Ivory Coast Department of Geography Training and Research Unit (UFR) Communication Environment and Society University Alassane Ouattara Bouaké Ivory Coast Soil Water and Geomaterials Sciences Laboratory (LS2EG) Earth Sciences and Mining Resources Training and Research Unit (UFR STRM) Félix Houphou&#235t-Boigny University Abidjan Ivory Coast

As part of the drive to improve coffee and cocoa production in Ivory Coast, studies are carried out to identify soils that are favourable for these crops. It is therefore necessary to orientate soil investigations based on reliable criteria that best discriminate soil cover. With this in mind, this study is being carried out to help improve survey methods by mapping soil landscapes. It uses GIS and weighted multicriteria analysis. To do this, satellite images were processed and the geological map of the square degrees of M’Bahiakro and Daloa was reclassified. The results show that relief is the main factor in soil landscape differentiation, with respective weights of 0.58 and 0.67 for the forest and pre-forest zones. In contrast, the weight of geological formation in soil landscape differentiation remains low (0.05 for the forest zone and 0.07 for the pre-forest zone). The criteria used on the base of aggregation sum methods have made it possible to formulate soil landscape mapping prediction functions according to agro-ecological environments in the humid intertropical zone. This is essential for the orientation of soil survey work. nevertheless, other comparative methods, such as the coding mapping method, could provide elements for discussion to validate the models.

关键词： GIS Multi-Criteria Analysis Soil Landscapes M’Bahiakro Daloa Ivory Coast

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Multicriteria Analysis by Codification for the Determination of Soil Landscape Units in Forest and Pre-Forest Zones of Cote D’Ivoire: The Case of the Square Degrees of M’Bahiakro and Daloa

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International Journal of Geosciences 2024年第1期15卷 12-24页

作者： guy Fernand Yao Derving Baka Koffi Emmauel Kassin Bala Mamadou Ouattara nestor Kouman Yao Kouakou kouadio Amani Jean Lopez Essehi Brou Kouame Albert Yao-Kouame national Agricultural Research Center (CnRA) Central Laboratory Soils Water and Plants (LCSEP) Sustainable Soil Management and Water Control Program Bouaké Ivory Coast Earth Sciences and Mining Resources Training and Research Unit (UFR STRM) Soil Water and Geomaterials Sciences Laboratory (LS2EG) Félix Houphou&#235t-Boigny University Cocody-Abidjan Abidjan C&#244te d’Ivoire Mondelez International Abidjan C&#244te d’Ivoire Training and Research Unit (UFR) Communication Environment and Society Department of Geography University Alassane Ouattara Bouaké C&#244te d’Ivoire Soil Water and Geomaterials Sciences Laboratory (LS2EG) Earth Sciences and Mining Resources Training and Research Unit (UFR STRM) Félix Houphou&#235t-Boigny University Abidjan Ivory Coast

The present study, carried out in the forest (Daloa) and pre-forest (M’Bahiakro) zones of Cote d’Ivoire, aims to determine soil landscape units using the coding method. Geological maps and satellite images (SRTM and Landsat) were used for this purpose. The methodological approach adopted consisted in producing maps of slope, geology, land use and topography using the codification method. These various maps, integrated into a GIS using the coding aggregation method, were used to generate soil landscape maps. Twenty-seven (27) soil landscapes have been identified for the pre-forest zone (M’Bahiakro), with a strong dominance of acid rock over a moderate relief under savannah, forest/degraded forest and crops/fallow. However, the forest zone (Daloa), with forty-one (41) soil landscapes identified over the entire zone, is characterized by a majority of mafic rocks on a medium altitude under forest/degraded forest, water and crops/fallow. The criteria used from the codification method (sum of aggregations) made it possible to predict the spatial distribution of soil map units according to agro-ecological environments in the humid intertropical zone. This is essential for the orientation and reinforcement of soil survey tools. However, a comparative evaluation of the different multicriteria analysis methods for coding and weighting soil landscape unit mapping would enable us to identify the most suitable and efficient method for drawing up base maps for soil surveys.

关键词： GIS Multicriteria Analysis by Coding Soil Landscapes Daloa M’Bahiakro Cote D’Ivoire

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Response of the Maize Variety EV87-28 to a Fertilization Strategy Involving Indorama Granular Urea on Ferralsol in the Central Ivory Coast

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Agricultural Sciences（农业科学） 2024年第1期

作者： Fernand guy Yao kouadio Amani Brou Kouame Jean Lopez Essehi Brahima Kone kouadio Houphouet Cheikh Ahmed Diawara Bala Mamadou Ouattara Albert Yao-Kouame

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Theoretical Study of the Reaction of (2, 2)-Dichloro (Ethyl) Arylphosphine with Bis (2, 2)-Dichloro (Ethyl) Arylphosphine by Hydrophosphination Regioselective by the DFT Method

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Computational Chemistry 2017年第3期5卷 113-128页

作者： kouadio Valery Bohoussou Anoubilé Benié Mamadou guy-richard Koné Affi Baudelaire Kakou Kafoumba Bamba nahossé Ziao Laboratoire de Thermodynamique et de Physico-Chimie du Milieu UFR SFA Université Nangui Abrogoua Abidjan République de C&ocirc te-d’Ivoire Laboratoire de Chimie Bio-Organique et de Substances naturelles (LCBOSn) UFR SFA Université Nangui Abrogoua Abidjan République de C&ocirc te-d’Ivoire

For this work, we have selected two reactions for the formation of (2,2)-dichloro (ethyl) Arylphosphine and bis (2,2)-dichloro(ethyl)arylphosphine compounds by hydrophosphination. Global and local reactivity parameters, thermodynamic parameters of reactions, Transition states, the Fukui function, the local softness, the local electrophility index, and nucleophility index, natural population analyses (nPA) and Mulliken (MK) were calculated with DFT method at B3LYP/6-311+G(d, p) level. The analysis of potential energy surfaces and the nature of the reaction mechanism have been determined. The various results obtained revealed that the addition of Arylphosphine is regiospecific. The phenylphosphine is more stable than the thiophenylphosphine. The theoretical results are consistent with experience.

关键词： Hydrophosphination Phosphine HOMO LUMO Fukui Index Transition State

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Erratum to “Theoretical Study of the Reaction of (2, 2)-Dichloro (Ethyl) Arylphosphine with Bis (2, 2)-Dichloro (Ethyl) Arylphosphine by Hydrophosphination Regioselective by the DFT Method” [Computational Chemistry 5 (2017) 113-128]

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Computational Chemistry 2020年第1期8卷 14-16页

作者： kouadio Valery Bohoussou Anoubilé Benié Mamadou guy-richard Koné Affi Baudelaire Kakou Kafoumba Bamba nahossé Ziao Laboratoire de Thermodynamique et de Physico-Chimie du Milieu UFR SFA Universite Nangui Abrogoua Abidjan Republique de Cote-d’Ivoire Laboratoire de Chimie Bio-Organique et de Substances naturelles (LCBOSn) UFR SFA Universite Nangui Abrogoua Abidjan Republique de Cote-d’Ivoire

The original online version of this article (kouadio Valery Bohoussou1, Anoubilé Benié2, Mamadou guy-richard Koné1, Affi Baudelaire Kakou2, Kafoumba Bamba1, nahossé Ziao1) Theoretical Study of the Reaction of (2, 2)-Dichloro (Ethyl) Arylphosphine with Bis (2, 2)-Dichloro (Ethyl) Arylphosphine by Hydrophosphination Regio selective by the DFT Method. Computational Chemistry 5 (2017) 113-128. DOI: 10.4236/cc.2017.53010) unfortunately contains a mistake. The author wishes to correct the errors from Table 3 to Table 4, on pages 121 and the beginning of page 122.

关键词： Erratum

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Level of Contamination of Fishponds Water in Pesticide Residues and Metallic Trace Elements (Pb, Cd, As, Hg): Case of Fishponds of ZEPREGUHE (Daloa, Côte d’Ivoire)

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Journal of Agricultural Chemistry and Environment 2022年第4期11卷 307-317页

作者： Kacou Alain Paterne Dalogo Ano guy Serge Ehouman James Halbin kouadio David Leonce kouadio Edi Jean Frejus Ehui Karim Sory Traore Laboratory of Environmental Sciences and Technology Jean Lorougnon GUEDE University Daloa C&ocirc te d’Ivoire Laboratory of Environmental Sciences Nangui Abrogoua University Abidjan C&ocirc te d’Ivoire Agroforestry Training and Research Unit Biochemistry-microbiology Department Agrovalorisation Laboratory Jean Lorougnon GUEDE University Daloa C&ocirc te d’Ivoire

Fishponds waters intended to satisfy the nutritional needs of the populations in terms of supply of fish resources are strongly and unfortunately exposed to the mobility and dispersion of metallic trace elements (TMEs) or to the persistence in the environment and in the form of pesticide residues from human activities. The objective of this work is to evaluate, on the one hand, the levels of identified pesticide residues and, on the other hand, those of researched TMEs (lead, cadmium, mercury and arsenic) in the waters of ponds used for fish farming in Zépréguhé, a locality located 9 km from the town of Daloa in the centre-west of Côte d’Ivoire. The dosage of the samples carried out by means of a gas chromatograph coupled to a mass spectrometer (GC/MS) made it possible to detect nine (9) pesticide molecules, including eight (8) organochlorines and a single molecule from the pyrethroid family, obtained from the detection limit of 0.006 μg/L and the quantification limit of 0.018 μg/L. The maximum average concentration was obtained with α-endosulfan for a content reaching 0.8038 μg/L and well above the maximum admissible concentration of 0.1 μg/L. The TMEs were quantified using an atomic absorption spectrophotometer (AAS). Arsenic is the most abundant metal with an average concentration of 9.497 μg/L. With the exception of lead, these measured levels are above the acceptable limit values for freshwater. This study showed that human activities such as the use of fertilisers and plant protection products in plantations, sand extraction and road traffic have a negative impact on the quality of the water in ponds used for fish breeding.

关键词： Fishpond Water Metallic Trace Elements Pesticide Residues Maximum Residue Levels

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Contribution of GIS to Soil Landscape Mapping by Multi-Criteria Analysis Using Weighting: The Case of the Square Degrees of M’Bahiakro (Centre) and Daloa (Centre-West) in Ivory Coast

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Open Journal of Geology（地质学期刊） 2024年第1期

作者： guy Fernand Yao Derving Baka nestor Kouman Yao Kouakou Bala Mamadou Ouattara kouadio Amani Jean Lopez Essehi Brou Kouame Albert Yao-Kouame

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