Abdoukarim Alassane^1*, Rim Trabelsi², Léonce F. Dovonon³, Diane J. Odeloui¹, Moussa Boukari¹, Kamel Zouari², Daouda Mama¹

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¹ Laboratoire d’Hydrologie Appliquée, Faculté des Sciences et Techniques, Université d’Abomey-Calavi, Abomey-Calavi, Bénin.
² Laboratoire de Radio-Analyse et Environnement, Ecole Nationale d’Ingénieurs de Sfax, Université de Sfax, Sfax, Tunisie.
³ Laboratoire d’Etude et de Recherche en Chimie Appliquée, Ecole Polytechnique d’Abomey-Calavi, Université d'Abomey-Calavi, Abomey-Calavi, Bénin.
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Abstract: In southern Benin, where population is growing and water demand for domestic activities is increasing, water balance assessment constitutes a serious concern about sustainability of water resources. Major ions have been employed with statistical methods to identify geochemical processes controlling groundwater quality. Multivariate statistical analysis (principal component analysis “PCA” and hierarchical cluster analysis “HCA”) revealed the main sources of groundwater mineralization. According to the hydrochemical data and the methods of treatment, groundwater mineralization in the investigated aquifer is caused by four main processes: 1) mixing with Nokoué lake and Porto-Novo lagoon salt water causing salinity to increase in the southern part of the aquifer; 2) anthropogenic activities; 3) cation exchange process; and 4) soil CO₂ diffusion providing a large proportion of bicarbonates.

Keywords: Hydrogeochemical Process, Pollution, Shallow Groundwater, Continental Terminal, Benin

Cite this paper: Alassane, A. , Trabelsi, R. , Dovonon, L. , Odeloui, D. , Boukari, M. , Zouari, K. and Mama, D. (2015) Chemical Evolution of the Continental Terminal Shallow Aquifer in the South of Coastal Sedimentary Basin of Benin (West-Africa) Using Multivariate Factor Analysis. Journal of Water Resource and Protection, 7, 496-515. doi: 10.4236/jwarp.2015.76040.

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