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Objective: The main objective of this study was to assess the degree of contamination of surface waters by heavy metals and pesticides. Method: To this end, data were collected in December 2022 from four specific sampling stations: Okpara, Térou, Affon and Adjiro. Levels of heavy metals, including cadmium, chromium, copper, iron, mercury, nickel and lead, were measured and subjected to in-depth statistical analysis using graphical summation models. In addition, the concentrations of pesticide active ingredients present in the samples were interpreted and evaluated. The statistical data collected during this study were processed using R software, version 3.5.0. Results: The values obtained at the different stations Okpara, Térou, Affon and Adjiro are respectively Arsenic (2 × 10-4 mg/L; 2.2 × 10-1 mg/L; 1.2 × 10-4 mg/L; 2 × 10-4 mg/L), Cadmium (4.4 × 10-5 mg/L; 1.1 × 10-2 mg/L; 10-4 mg/L; 4 × 10-4 mg/L). Then Copper (7 × 10-4 mg/L; 3 × 10-3 mg/L; 7 × 10-4 mg/L; 1 × 10-4 mg/ ....
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