Abstract
The aim of this paper is the evaluation of the trophic status of three lakes riparian to the Colentina River, namely Mogosoaia, Herastrau, Pantelimon, as Part III of an extended study on evaluation of the freshwater resources quality in Bucharest and surrounding areas [1, 2], supplementing the general quality assessment based on indices and indexes presented in Part I with a more in depth analysis of nutrient speciation and partitioning between water and upper sedimentary layers. Water and sediment samples were taken from the inlet and outlet areas of each lake in two sampling campaigns in July 2016 and September 2016. Some of the nutrient related water quality parameters presented in Part I of this series have been used here, together with the analysis of total nitrogen and total phosphorus content in sediments, to assess the general trophic state of the lakes and to highlight the relationships between the nitrogen and the phosphorus content from water and sediments.The studied lakes were found to be eutrophic, Mogosoaia and Pantelimon being in the most advanced state. A significant amount of nitrogen and phosphorus was detected in all sediments analysed, constituting a high accumulation of nutrients from anthropogenic activities. Actions to improve local sanitation infrastructure and to prevent anaerobic leakage of nutrients from sedimentary deposits are recommended.
Highlights
Water is an important receptor of the environmental problems generated by various activities from the human society, being an essential ecological component for sustainable development
Urban lakes are exposed to a high risk of pollution, large amounts of pollutants lead to increased eutrophication, which affects the habitat of wildlife and the quality of human life [19, 20]
The nutrient levels in the water samples are presented in figure 4
Summary
Water is an important receptor of the environmental problems generated by various activities from the human society, being an essential ecological component for sustainable development. The major cause of water eutrophication is the supplementation, beyond the water body equilibration capacity and often beyond permitted legal limits, of nutrients containing phosphorus and nitrogen Their excess determines the abnormally increased production of algae and higher plants, leading to increased turbidity and lower dissolved oxygen concentrations, phenomena which are accompanied by the disappearance of aquatic fauna [8, 9]. In the peripheral area of Bucharest, due to the urban expansion and development of residential areas, the water quality of the artificial lakes has decreased significantly. This process is largely underlined by the poor coverage of the public sewerage system. Urban lakes are exposed to a high risk of pollution, large amounts of pollutants lead to increased eutrophication, which affects the habitat of wildlife and the quality of human life [19, 20]
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