Seasonal contamination level of the waters from the Déganobo lake system by fourteen herbicides residues and their ecological and health implication

The aim of this study was to assess the seasonal contamination level of the waters from the Déganobo lake system by 9 triazine herbicides and 5 substituted urea herbicides and, their ecological and risks implications. It was conducted during one year (from August 2021 to July 2022). The waters samples, collected monthly, were analysed according M.A. 403-Pest 3.1 standard with some modifications. The ecological and health risks were assessed by using the Directive 2013/39/EU, the MDDP water quality guidelines, the SEQ-Eau V2 water quality guidelines and, the Quotient Risk. Simazine was the herbicide residue the most important, whereas atrazine, chlorotuluron and, terbutryn were the least important in all season. Diuron, fenuron, monuron and, Terbuthylatrazine were not detected in these waters in all seasons. The hydroclimate, as well the temperature, transparency and, dissolved oxygen of these waters, were influenced significantly the seasonal dynamic of the herbicide residues detected in these waters. All the water quality guidelines used in this study and the quotient risk were highlighted the relative high pollution of these waters with likely severe health risks for its biota and for human in all season, because of its high seasonal concentrations in simazine.