Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Analysis and Control of the Physicochemical Quality of Groundwater in the Chari Baguirmi Region in Chad

Version 1 : Received: 23 August 2020 / Approved: 25 August 2020 / Online: 25 August 2020 (10:02:42 CEST)

How to cite: Beyaitan Bantin, A.; Jun, X.; Wang, H. Analysis and Control of the Physicochemical Quality of Groundwater in the Chari Baguirmi Region in Chad. Preprints 2020, 2020080544 (doi: 10.20944/preprints202008.0544.v1). Beyaitan Bantin, A.; Jun, X.; Wang, H. Analysis and Control of the Physicochemical Quality of Groundwater in the Chari Baguirmi Region in Chad. Preprints 2020, 2020080544 (doi: 10.20944/preprints202008.0544.v1).

Abstract

Water resources are threatened nowadays by pollution that comes from domestic, industrial and agricultural discharges without prior treatment. This pollution causes the degradation of water quality. Surface pollutants can seep through the soil into water tables. The objective of our work is to assess and control the physicochemical quality of the Chari Baguirmi groundwater, to protect human health. The quality of 83 boreholes was assessed, while performing analysis for 12 physicochemical parameters at the National Water Laboratory and at the Center for Quality Control of Foodstuffs in Chad. These parameters are: pH, EC, Ca2+, Mg2+, Na+, K+, Cl-, SO42-, NH4+ and NO3- , Fe2+ and HCO3-. Also, the results obtained were compared with WHO standards. The geochemical statistical approach has made it possible to characterize the hydro geochemical properties and to understand the major processes of the mineralization of groundwater resources in Chari Baguirmi region in Chad. Some of its waters are acidic and weakly mineralized, rich in Fe2+ and NH4+. The origin of the mineralization is due to the alteration of the host rocks and to the hydrolysis of silicate and ferromagnesian minerals as well as anthropogenic pollution. The ammonium concentrations in N’Djamena boreholes are higher than WHO standards, indicating the presence of pollution which may come from organic waste. These results constitute a preliminary step in understanding hydro geochemical functioning and a basis for monitoring the physicochemical quality of the water in the study area.

Subject Areas

Analysis; control; physicochemical quality; groundwater; Chari Baguirmi region; Chad

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