[84410] Artykuł: Spatio-temporal Variations in Water Quality Parameter Trends in River WatersCzasopismo: REVISTA DE CHIMIE Tom: 69, Zeszyt: 10, Strony: 2940-2947ISSN: 0034-7752 Wydawca: CHIMINFORM DATA S A, CALEA PLEVNEI NR 139, SECTOR 6, BUCHAREST R-77131, ROMANIA Opublikowano: 2018 Autorzy / Redaktorzy / Twórcy Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 20 Klasyfikacja Web of Science: Article Pełny tekst DOI Web of Science Keywords: Water quality  Water pollution  Trend analysis  Mann-Kendall statistical test  |
Evaluating trends in water quality indicators is a crucial issue in integrated water resource management in any country. In this study eight chemical and physical water quality indicators were analysed in seven river profiles in the River Laborec in eastern Slovakia. The analysed water quality parameters were biochemical oxygen demand (BOD5), chemical oxygen demand (COD), pH, temperature (t), ammonium nitrogen (NH4+-N), nitrite nitrogen (NO2--N), nitrate nitrogen (NO3--N), and total phosphorus (TP). Data from the monitored indicators were provided by the Kosice branch of the Slovakian Water Management Company, over a period of 15 years from 1999 to 2013. Mann-Kendall non parametric statistical test was used for the trend analysis. Biochemical and chemical oxygen demand, ammonium and nitrite nitrogen content exhibit decreasing trends in the River Laborec. Decreasing agricultural activity in the area has had a significant impact on the trends in these parameters. However, NO2--N was the significant parameter of water quality because it mostly exceeds the limit value set in Slovak legislation, Regulation No. 269/2010 Coll. In addition, water temperature revealed an increasing trend which could be caused by global increase in air temperature. These results indicate that human activity significantly impacts the water quality.