Modelling of impact of presence/absence of suspended particulate organic matter from river and sea and effluent wastewater on fluorescence signal in the coastal area of Gapeau River

Organic matter has an important role in biogeochemistry aquatic environments. This study investigated impact of suspended particulate organic (SPOM) on fluorescence signal mixtures three water types (river RW, sea SW, effluent wastewater WW) using (excitation-emission matrix, EEM) spectroscopy and parallel factor analysis (PARAFAC) multilinear regression. Four irradiation experiments (Expt-1, Expt-2, Expt-3, Expt-4) were conducted during different times the year ( two autumn, one winter, spring season). Samples exposed to natural sunlight laboratory rooftop University Toulon, France, with another set samples kept dark as control samples. Three component (C1, C2, C3) model was validated by split-half Concordia from whole EEM dataset all experiments. No protein-like fluorophores found. The revealed effect SPOM presence/absence DOM resulting parameters regression MLR kinetic constant these parameters. Kinetic (k) for coefficients order greatness Expt-1 (SPOM WW only mixtures) > Expt-3 SW Expt-2 RW mixtures)> Expt-4 + indicating that is most resistant photodegradation. For samples, relative standard deviation RSD could be calculated dataset. values C3 highest its chaotic variations, lowest found both C1 C2 Statistical differences been between irradiated These models developed this can used predict anthropogenic transport river systems coastal zone.