Long-term temporal changes of precipitation quality in the mountainous region of Chopok (Low Tatras, Slovakia)

The paper has analysed the data about chemical composition of precipitation at Chopok EMEP station. The database comprised the information about the concentrations of sulphates, nitrates, ammonia ions, base cations and heavy metals (Cd, As, Al, Zn). The results are presented in a graphical form showing long-term temporal trends in the chemical composition of precipitation. The statistical characteristics of temporal trends were tested with Student method analysing the significance of the sampling coefficient of correlation. We revealed that the majority of concentrations of selected elements in precipitation significantly decreased in time.