Abstract
This research work deals with the physico-chemical analysis of the surface water of the Djiri river with the aim of preventing the population against possible water pollution.
 
 The analysis of the samples collected in the Djiri river revealed the presence of lead in these waters at levels exceeding the WHO guideline values: an average annual pollution (0.93 mg / l) which is visibly above the WHO guideline value (0.01mg / l).
 
 The in situ data of the Djiri river revealed a significant drop in flow between the period 2016 characterized by a divergence index of 0.82344 thus highlighting a hydrological situation for which the actors of national hydrology will absolutely have to implement measures. Remedial mechanisms to protect this river against possible disappearance.
Highlights
The Djiri river is located in the 8th arrondissement of Brazzaville, with a flow of 25 m /s, it flows into the Congo river
Sampling marks the starting point of the process of acquiring experimental data; Sampling consists of carrying out a series of water samples from the Djiri river once a month at each point chosen in order to carry out physicochemical analyzes leading to the qualitative state of the waters of the Djiri; These physico-chemical analyzes will take place in the IRSEN's physico-chemical analysis laboratory; The protocol adopted for the analysis of the samples is spectrophotometry and the spectrophotometric analysis is based on the following parameters: PH, T°C, CE,Ca,Mg,K,TAC,NH,Cu,Al,Mn, SO,PO,Fe,NO,Cr, Cl,Sand, Suspended matter, Dry residue
-The study of the quality of surface water and its impact on the environment in the Wilaya of Skikda (Mohamed Zine BELHADJ, 2017) in Algeria revealed the significant presence of toxic metallic trace elements in the water, in particular Lead levels found in these surface waters exceed the WHO acceptable standard, testifying to water contamination; the results of our study reveal the exceedances at each sampling point of the WHO admissible standard and confirm, through the indices and the estimated degree of pollution, values showing lead contamination of the waters of the Djiri river;
Summary
The Djiri river is located in the 8th arrondissement of Brazzaville, with a flow of 25 m /s , it flows into the Congo river. It is likely to release toxic particles into the waters of the Djiri River that can cause damage to the environment in general and to human health in particular. This work is part of the protection of the water ecosystem and the health risk coverage of neighboring populations. The problem of water pollution is closely linked to that of water quality and requires special attention in the Congo as in most developing countries; the faster a diagnosis of poor quality of water for use is made, the quicker the means can be implemented to provide solutions to cover health and environmental risks. We estimated the physico-chemical and metallic quality of Djiri's surface water from two sampling points: Djiri Station (Upstream Point) and Old Djiri Manianga Bridge (Downstream Point).
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