Seasonal variability of physical and chemical properties of the water in lake Kolové pleso, the West Carpathians
This study examines the physical and chemical limnology of lake Kolové pleso in order to understand the response of the high mountain lake ecosystem to seasonal, climatic and anthropogenic impacts. We have combined regular monthly monitoring of physical properties on site and analyzed the chemical composition of the lake, using nutrient photometry, X-ray analysis of elements and COD methods. Fluctuations and concentrations of these variables confirmed that the lake is affected by seasonal fluctuations, subsoil, bioaccumulation of elements, vegetation and atmospheric deposition and climate variables. No potential pollution was detected by these indicators. The GC-MS method was used to qualitatively identify organic substances in the lake that were potentially harmful. PAHs (phenanthrene and pyrene) were found during the heating period (winter months). Due to the extensive rainfall in July 2018, during the experiment, we had the opportunity to observe the effect of flooding on the lake. Flooding has a significant impact on the organic composition of the lake (COD) as well as on some chemical elements (S, K, Rb, Mo, Cd), whose values dropped significantly following the flood. The decrease in COD values influenced the acidity of the lake negatively, as seen in the past.
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