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ASSESSMENT OF ORGANIC MATTER TEMPORAL VARIABILITY IN URBAN LAKES
Abstract
Cities have a significant contribution to the contamination of urban lakes by input with surface runoff, illegal wastewaters discharges, sewage discharges, which lead to increased eutrophication and reduce the ecological health status. Complex temporal monitoring is needed to understand the changes in water quality, including dissolved organic matter. This study presents the first temporal evaluation of dissolved organic matter from urban lakes, using fluorescence spectroscopy. Samples were collected from urban lakes, created along Colentina River, located in the Northern part of Bucharest, Romania. The samples were collected between 2010 and 2016, in different climatic and hydrological conditions. Several degradation sources have been identified along the urban lakes, including residential areas, unorganized waste disposal, and pesticides from parks treatments or diffuse runoff from urban environment. The fluorescence signal of both major fractions of dissolved organic matter, protein-like and humic-like, were detected in the samples. The protein-like fraction dominated the fluorescence spectra of most samples. However, a predominance of the humic-like component was also detected, depending on the environmental conditions. In conclusion, the study showed a high accumulation of dissolved organic matter in particular lakes, which could generate a high degree of eutrophication with serious consequences to the ecological health and anthropic use.
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