The Study of some Physical–Chemical Parameters of Water

Abstract

Paper presented to the investigation conducted in two fish ponds on biological year March to October 2008. The study highlights the fluctuations physical - chemical: temperature, dissolved oxygen, organic substance, nutrients along with the dynamics of phytoplankton development season and ecological analysis of this group in relation to the variables analyzed, the factors that concur at degree impurification of water. Water temperature increases simultaneous with the air temperature, highest value recorded in the summer. Evolution of phytoplankton fallow an variables season in depending of physical-chemical parameters studied; the spring season is dominated by blue algae (16-18 species), their number decreasing with increasing values of temperature, number of blue algae were relatively constant throughout the year, the share increase is green algae species dominated in summer and autumn. Dissolved oxygen shows a gradual fall with submission to the summer months leading to an intensification of the processes of degradation of organic matter, influence such variations that occur at the pH, which increases and fluctuations of nutritive elements based on nitrogen N-NH4, N -NH3-N NO2-, NO3-N and phosphorus P-PO4, depending on which water falls into the category mesosaprobic. Meet excellent indicators of a class of water quality mesosaprobic: Synedra, Nitzschia, Melosira, Closteriopsi acicularis, Actinastrum hantzschi, Monoraphdyum grifitti, Scenedesmus opoliensis, Pediastrum duplex