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Danube Qualitative characteristics of the water in the Pontic sector. The article analyses the spatial and temporal variation in the lower Danube sector of the physico-chemical quality indicators, selected to reflect the general characteristics and the effect / impact of the main pressures identified at basin level for the period 1996-2015, in 6 monitoring sections (from Baziaș to Reni). Based on the minimum, average and maximum multi-year values for all physic-chemical determinants that reflect the degree of variability of the values of the concentrations monitored for the analysed periods, they were interpreted in particular from the perspective of the interdependence between these parameters, their behaviour, the aquatic transformations /reactions, as well as from the point of view of correlation with the contribution of tributaries and sources of pollution. Longitudinal (upstream / downstream) variations have also been established over the 20-year period, concluding that most determinants / pollutants have an increasing spatial trend. From a temporal point of view, all determinants analysed from the point of view of the water quality improvement trends were determined, namely the temporal trends (especially in the Reni section) and the possible causes of variation were identified.

Danube - Qualitative characteristics of the water in the Pontic sector