International Science Community Association International Research Journal of Environmental Sciences 2319-1414 8 3 2019 07 22 Assessment of groundwater pollution in the garages: case study of Cotonou districts 62 69 EN Singh Raj 1 Department of Environmental Science, Baba Farid Institute of Technology, Dehradun–248007, India Mishra Arun P. 2 Department of Environmental Science, Baba Farid Institute of Technology, Dehradun–248007, India Zita Flora Diamouangana Mpissi 1 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo Joseph-Marie Moutou 2 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo and Ecole Normale Supérieure University, Marien Ngouabi B. P. 69, Brazzaville, Congo Laurent Matini 3 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo and Ecole Normale Supérieure University, Marien Ngouabi B. P. 69, Brazzaville, Congo Fraîde Mongo Oladzou Michel Christ 4 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo Merline Kouhounina Banzouzi Lady 5 Laboratoire de Chimie minérale et Appliquée, Faculté des Sciences et Techniques, Brazzaville, Congo Meena Vinay Kumar 1 University Department of Civil Engineering, Rajasthan Technical University, Kota– 324010, India Choudhary Mahendra Pratap 2 University Department of Civil Engineering, Rajasthan Technical University, Kota– 324010, India Ogemdi Iwuozor Kingsley 1 Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria Chidubem Ekpunobi Emmanuel 2 Department of Microbiology, Abia State University, Abia State, Nigeria D. Jadhav Raju 1 Room No. B1/701, Saket Co-op. Hsg. Society Ltd., Saket Road, Thane (W)–400601, Maharashtra, India B. Mali Harishchandra 2 House No. 1910, Opp. Vittal Mandir, Mahatma Gandhi Nagar, Near Anandnagar, Thane (E)–400603, Maharashtra, India Ngoma Frédéric Balounta 1 Laboratory of Mechanics Energy and Engineering, Higher National Polytechnics School, Marien Ngouabi University, Brazzaville, Congo Tathy Christian 2 Laboratory of Mechanics Energy and Engineering, Higher National Polytechnics School, Marien Ngouabi University, Brazzaville, Congo and Department of Exact Sciences, Higher Teacher′s Training School, Marien Ngouabi University, Brazzaville, Congo Niere Romain Richard 3 Laboratory of Mechanics Energy and Engineering, Higher National Polytechnics School, Marien Ngouabi University, Brazzaville, Congo Salam Mohammed Abdus 1 Faculty of Science, Department of Environmental Science and Disaster Management, Noakhali Science and Technology University, Noakhali-3814, Bangladesh Khan Md. Shohel 2 Faculty of Science, Department of Environmental Science and Disaster Management, Noakhali Science and Technology University, Noakhali-3814, Bangladesh Sarker Md. Abu Hena 3 Faculty of Science, Department of Environmental Science and Disaster Management, Noakhali Science and Technology University, Noakhali-3814, Bangladesh Idohou Jeanne A. 1 Laboratory of Water Technical Sciences (LSTE), University of Abomey-Calavi Akowanou Akuemaho A.V. 2 Laboratory of Water Technical Sciences (LSTE), University of Abomey-Calavi Yovo Franck 3 Laboratory of Physico Chemical, (LCP/ FAST / UAC), 01 PO Box 526 Cotonou, Benin Adounkpe Julien 4 Environment Managment Planification School, Abomey-Calavi University, PO Box 526 Cotonou, Benin Onifade Sofiatou A. 5 Laboratory of Water Technical Sciences (LSTE), University of Abomey-Calavi Aina Martin P. 6 Laboratory of Water Technical Sciences (LSTE), University of Abomey-Calavi Kpoviessi Salomé 7 Laboratory of Physical and Synthetic Organic Chemistry, Abomey-Calavi University, Faculty of Technicals Sciences Cotonou BP 4521, Benin Sohounhloue Dominique C.K. 8 Laboratory of Study and Research in Applied Chemistry (LERCA), Polytechnical School of Abomey Calavi, 01 PO Box 2009 Cotonou, Benin > Case Study 2018 11 18 2019 07 22 In Benin, waste oils which containing hydrocarbon, additives, and heavy metals are spilled on the soil. In Cotonou, groundwater is flush and the soil has a very high permeability. The aim of this study is to characterize water of wells and assess the extent of groundwater pollution. Samples of well water and soils were collected from three garages in three districts (10th, 11th and 13th). The reducing power (13,7 < RH <14,8) are less than 15 for all samples indicating a reducing character of groundwater. This was confirmed by low concentrations obtained in dissolved oxygen where the reduction in sulfides and sulfates create respectively the reduction in nitrates and nitrites ions. Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC) revealed high organic load with migration of pollutants into groundwater. The absorbance and SUVA index revealed the presence of aromatic hydrocarbons with high aromaticity in the 13th district site. Copper and lead values showed a solubility of migrant lead to groundwater with concentration equal to 14mg/L. We note that the grounds under the garages in Cotonou city were heavily polluted. Copyright@ International Science Community Association