Impact of anthropogenic organic matter on the fluorescence in coastal zone

Abstract : Anthropogenic activities have done major changes to our global system. The coastal dissolved organic matter has great influenceon the global carbon cycle and hence climate change. The riverine input of dissolved organic matter represents the terrestrialorganic matter. Urbanized rivers is greatly impacted by the anthropogenic dissolved organic matter coming from wastewatertreatment plants . Chromophoric dissolved organic matter is a subgroup of the dissolved organic matter which can absorb light.Fluorescent dissolved organic matter in turn is a subgroup of the chromophoric dissolved organic matter .The fluorescence signalof the anthropogenic dissolved organic matter in the coastal zone is not well characterized and evaluated in the literature.Photochemically induced degradations and changes at the molecular level is considered to be a great process which could influencethe dissolved organic matter . In the present study, Laboratory mixing experiments several sunlight irradiation experiments wereconducted with several modes of filtration of three endmember mixing components ( River water, Sea water , wastewater treatmentplant effluent discharge) with the objective of finding a specific signal of fluorescence which could be a tracer of the anthropogenicdissolved organic matter through using the fluorescence spectroscopy excitation emission matrices (EEMs) coupled with thechemometric statistical technique of Parallel Factor analysis CP/PARAFAC. Moreover, multilinear regression model between thecontribution of CP/PARAFAC components and two content fraction of River water and Seawater endmember was developed. Inaddition the kinetics of the multilinear regression parameters were investigated. On top of that , geographical investigations of theevolution of fluorescence signal in the Gapeau river till the sea were conducted. Furthermore, Temporal investigation of thefluorescence signal for four water points in the pathway of Gapeau river were done. The multilinear regression model developedwas applied to model the results of the geographical and temporal field experiments. Results have shown that Multilinearregression model for contribution of CP/PARAFAC components is excellent and could be done for the three endmembers. Inaddition the search for specific fluorescence signal or signature for river water, wastewater treatment plants and sea water couldn’tbe done in this work. In human impacted coastal zone, residual fluorescent organic matter come from wastewater treatment plant,and no specific signal from sea water could be detected near the coast.
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Ibrahim El-Nahhal. Impact of anthropogenic organic matter on the fluorescence in coastal zone. Biodiversity and Ecology. Université de Toulon, 2018. English. ⟨NNT : 2018TOUL0005⟩. ⟨tel-02134307⟩

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