Author(s)

Abdoukarim Alassane¹, Waris Kéwouyèmi Chouti^1,2*, Hermione Adeke¹, Jechonias Hounkpe³, Daouda Mama¹, Moussa Boukari¹

¹Laboratory of Applied Hydrology, National Institute of Water (NIW), University of Abomey-Calavi, Cotonou, Benin.
²Laboratory of Inorganic Chemistry and Environment, Faculty of Sciences and Techniques (FAST), University of Abomey-Calavi, Benin.
³Laboratory of Geology, Mines and Environment, Faculty of Sciences and Engineering, University of Abomey-Calavi, Benin.

The objective of this research is to determine the physicochemical elements contained in the groundwater and in the deposits originating from these waters of the Arrondissement of Dêkin, Commune of Dangbo in the South of Benin. Physical parameters were measured from the multi-parameter and the chemical parameters by reagent assays. The precipitate from the groundwater was studied by speciation. The different assays were carried out using the Hach Lange DR2800 Spectrophotometer. The data processing was done with different software including ArcGis 10.1, Diagram.Ink of Roland SIMLER and PHREEQC 2.17.4137. Strong mineralization of the deposit from the drilling water was indicated in these three elements: Copper (220.1 mg/kg), iron (2528 mg/kg) and zinc (239.5 mg/kg) whose contents are higher than the French guideline values for heavy metal content in sediments in mg/kg. The calculation of the Saturation Indices of the drilling water shows saturation with respect to Goethite and Hematite. All these results have led us to conclude that the high content of Metallic Trace Element (MTE) in the deposit and especially of the iron in the drilling water originates from the dissolution-precipitation of the aquifer rock.

Metal Trace Element, Chemical Speciation, Groundwater, Geochemical Fraction, Dangbo, Benin

Alassane, A. , Chouti, W. , Adeke, H. , Hounkpe, J. , Mama, D. and Boukari, M. (2018) Sediment Speciation from Dekin Groundwater at District of Dangbo (South Benin). Journal of Geoscience and Environment Protection, 6, 59-72. doi: 10.4236/gep.2018.610005.