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6913393 
Journal Article 
Hydrochemical and isotopic characterization of groundwater in the southeastern part of the Plateaux Region, Togo 
Akpataku, KV; Rai, SP; Gnazou, MDT; Tampo, L; Bawa, LM; Djaneye-Boundjou, G; Faye, S 
2019 
1 
Hydrological Sciences Journal
ISSN: 0262-6667
EISSN: 2150-3435 
TAYLOR & FRANCIS LTD 
ABINGDON 
64 
8 
983-1000 
English 
WOS:000472362900001 
Hydrochemical, inverse geochemical modelling and isotopic approaches are used to assess the hydrogeochemical evolution of groundwater from the basement aquifers in the southeastern part of the Plateaux Region, Togo. Groundwater originates from present-day rainwater infiltration and is mostly fresh and slightly acidic to neutral. Hydrochemical facies are predominantly mixed cations-HCO3 associated with Ca/Mg-Cl, Na-HCO3 and Na-Cl water types in equilibrium with kaolinite and Ca/Mg-smectites. They are related to silicates hydrolysis, anthropogenic contamination, nitrification/denitrification, mixing along flowpaths and dissolution/precipitation of secondary minerals. The pattern of flow paths is in accordance with an increasing trend in total dissolved solids (TDS) toward the potentiometric depression located in the central and southern parts of the aquifer system. Inverse geochemical modelling using the NETPATH-WIN model showed the relative importance of biotite, plagioclase and amphibole weathering and dissolution of secondary carbonate minerals along the flowpath, suggesting that an abundance of minerals is not necessarily the main factor controlling the groundwater chemistry evolution. 
hydrochemistry; isotopes; basement aquifers; Plateaux Region; Togo