TITLE:
Sediment Speciation from Dekin Groundwater at District of Dangbo (South Benin)
AUTHORS:
Abdoukarim Alassane, Waris Kéwouyèmi Chouti, Hermione Adeke, Jechonias Hounkpe, Daouda Mama, Moussa Boukari
KEYWORDS:
Metal Trace Element, Chemical Speciation, Groundwater, Geochemical Fraction, Dangbo, Benin
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.6 No.10,
October
31,
2018
ABSTRACT: 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.