Estimarea proceselor de autopurificare a apelor lacului Dănceni prin conţinutul de substanţe biogene (perioada anilor 2015-2024) [Articol]

Abstract

The main purpose of the research is to estimate the self-purification processes of the waters of Lake Danceni through the concentration of biogenic substances over a period of 10 years. Water samples from the lake were collected seasonally with an intensity of 4-5 times per year according to current methodologies, and the mineral forms of nitrogen and phosphorus were determined by the spectrophotometric method using HACH reagents. According to the obtained data regarding the concentrations of nitrate and ammonium ions, the lake waters fall into quality classes II – V, which indicates anthropogenic pollution of the lake. The intensity of the self-purification processes, moderate to low, is confirmed by the values of the calculated nitrification index, which ranges from 41% to 89%. The concentration of phosphate ions indicates a decrease over time in the phenomenon of eutrophication of the lake, from quality class V in 2015 to class III in 2024.