Hydrochemistry of Groundwater in the Aquifer AQ-2 in Pointe-Noire, South-West Congo-Brazzaville

Tathy, Christian; Laurent, Michel; Mabiala, Bernard; Antoine, F.; N, G. Moukandi

doi:10.3923/rjasci.2010.361.369

Cited by 6 publications

(7 citation statements)

References 6 publications

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“…C.E and TDS are strongly correlated positively, which shows that the dissolved total solids translate electric conductivity correctly. In addition, the chemical variables Na + and K + present a good correlation with Cland SO 4 2-, which supposes the presence of chlorides and sulphates of these two major cations in the aquifer. The positive correlation between NO 3 and the captions Ca 2+ (r =0.87), Na + (r=0.98), K + (r=0.63) supposes a contamination of water by organic matter 8 .…”

Section: Correlation Matrixmentioning

confidence: 76%

Application of the Multivariate Statistical Analysis for Hydrogeochemical Assessment of Groundwater of Coastal Aquifer AQ1 of Pointe-Noire, Congo

2018

Chem Sci Trans

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Section: Correlation Matrixmentioning

confidence: 76%

Application of the Multivariate Statistical Analysis for Hydrogeochemical Assessment of Groundwater of Coastal Aquifer AQ1 of Pointe-Noire, Congo

2018

Chem Sci Trans

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“…The ions SO have a good correlation with TH (r=0.78). This shows that the SO ions would come from gypsum formation [2,21].…”

Section: Piper Diagrammentioning

confidence: 99%

“…According to the drinking water supply company "La Congolaise Des Eaux (LCDE)", the Pointe-Noire region has to day nearly 2000 private boreholes, and observations and surveys of groundwater on the ground indicate overexploitation of the aquifer AQ2 due to the proliferation of boreholes. Despite the importance of the economic and health interests at stake, the functioning of the aquifer in this zone poorly understood and the consequences of uncontrolled exploitation of deep boreholes have not been evaluated [1][2][3][4][5][6]. Pointe-Noire Region: Application of Multivariate Statistical Analysis Methods It is therefore important to know and control the quality of this resource.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Characterization of Waters in Aquifer AQ2 of the Pointe-Noire Region: Application of Multivariate Statistical Analysis Methods

Ngoma¹,

Tathy²,

Niere³

et al. 2022

WROS

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Located on the Atlantic coast, the city of Pointe-Noire is the economic capital of the Republic of Congo. It enjoys strong industrial activity, particularly oil, with the presence of a refinery and onshore drilling in its surroundings. The steady growth of its population leads to an increase in its drinking water supply needs, produced mainly from the exploitation of its aquifer system. Thus, in view of the growth of its human activities, the interest of permanent monitoring of the quality of its groundwater is becoming more and more great. The present study aims to assess the physicochemical quality of the groundwater in the AQ2 aquifer of the Pointe-Noire region during the period from 2017 to 2020, and to understand the processes that are at the origin of the mineralization of these waters. To this end, we obtained from the water supply company, La Congolaise Des Eaux (LCDE) seventy-five (75) water analysis reports bulletins representing the average values of thirteen (13) physicochemical parameters in each of the 75 boreholes used for this study so as to homogeneously cover the entire city. The Piper diagram revealed that the waters are dominated by three types of facies: K-Na-Cl, Mg-Ca-SO 4 -Cl and Mg-Ca-HCO 3 . The presence of the K-Na-Cl facies is due to the high levels of chlorides and sodium in the water-rock. The Principal Component Analysis (PCA) indicates that the mineralization of these waters results in the hydrolysis of silicate minerals. The Ascending Hierarchical Classification (AHC) analysis made it possible to determine the parameters that categorize the different classes from 2017 to 2020, these are TDS, EC and TH and to a lesser extent Ca 2+ , Mg 2+ , HCO 3 and TAC. Overall, the quality of the groundwater is good according to standards WHO, but in some cases requires specific treatment before supply.

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“…The Pointe-Noire region belonging to the Cretaceous and tertiary coastal sedimentary basin is covered by formations of plio-Pleistocene ages other than the series of circuses ( Figure 2), formed by highly permeable sands with multiple resistant horizons. The FAO classification (1998) classifies the soils of the Pointe-Noire region as belonging to the Ferralic Arenosols group, with a sandy texture (80% -90%) over 1 meter [13].…”

Section: Presentation Of the Study Areamentioning

confidence: 99%

“…Rom the point of view of its quality, it is true that the water in the surface water (AQ-1) of Pointe-Noire is little mineralized and that it reveals in its composition several chemical variations without gravity according to the seasons. The water in the deep water body QA-2, on the other hand, is heavier but does not require treatment for consumption [13].…”

Section: Water Resources Potentialmentioning

confidence: 99%

Stratigraphic Data and Groundwater Resources in the Coastal Sedimentary Basin of the Pointe-Noire Region (Republic of Congo)

N’kaya¹,

Ebale²,

Tathy³

et al. 2020

JWARP

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Hydrochemistry of Groundwater in the Aquifer AQ-2 in Pointe-Noire, South-West Congo-Brazzaville

Cited by 6 publications

References 6 publications

Application of the Multivariate Statistical Analysis for Hydrogeochemical Assessment of Groundwater of Coastal Aquifer AQ1 of Pointe-Noire, Congo

Application of the Multivariate Statistical Analysis for Hydrogeochemical Assessment of Groundwater of Coastal Aquifer AQ1 of Pointe-Noire, Congo

Physicochemical Characterization of Waters in Aquifer AQ2 of the Pointe-Noire Region: Application of Multivariate Statistical Analysis Methods

Stratigraphic Data and Groundwater Resources in the Coastal Sedimentary Basin of the Pointe-Noire Region (Republic of Congo)

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