DANIELA SIMINA STEFAN, NICOLETA NEACSU, IRINA PINCOVSCHI, MIRCEA STEFAN WATER QUALITY AND SELF-PURIFICATION CAPACITY ASSESSMENT OF SNAGOV LAKE The aim of this paper is to identify the spatial and temporal distribution of chemical and physical parameters that characterize the water quality, the trophic state and the self-purification capacity assessment of Snagov Lake. The Snagov Lake is a natural lake located at 25-30 km North from Romania’s capital, Bucharest. The study was conducted during a five years period, from April 2010 until October 2014. The measurements used (temperature, pH, dissolved oxygen, transparency, chlorophyll-a, total phosphorus, TN/TP ratio) are presented in the form of spatial and temporal evolutions. For self-purification identification the aerobic mineralization degree, biological depuration factor and TN/TP ratio were used. The trophic stage of Snagov Lake in the range and in all the points of sampling is eutrophic–hipereutrophic for all the parameters used for assessment, excepting several short periods of time (fall of 2010, spring and fall of 2011) when the lake was in mesotrophic state.
Keywords: Snagov Lake, trophic status, aerobic mineralization degree, biological depuration, TSI