Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. XIII
Written by Irina CATIANIS, Adriana Maria CONSTANTINESCU, Dumitru GROSU, Gabriel IORDACHE, Florin DUȚU, Ana-Bianca PAVEL
This study was carried out in the Danube Delta, at Ceatal Izmail and Ceatal Sfântu Gheorghe. The investigated sectors are of great importance, being essential key points related to the hydrological connectivity between the Danube River distributary branches and interdistributary channels, streams, and lakes of the Danube Delta. Thereby, six stations were selected to provide seasonal water quality data, collected biannually, from 2018 to 2023, in different hydrodynamic conditions (high and low waters). To assess the conditions of the investigated surface waters, several physical in-situ measurements (T, pH, DO, EC, TDS, Transp.) were taken at all sampling locations. Additionally, water samples were collected for laboratory analysis (N-NH4+, N-NO2-1, N-NO3-, P-PO43-, Chla, SiO2, TOC, SO42-, Turb., TSS, ORP). The criteria used to assess the water quality in the investigated sites include the current Romanian national legislation (Ord. 161/2006) and other international environmental standards. Most of the investigated physical-chemical parameters were in line with correlated criteria, and only incidentally, the objectives were exceeded at single or multiple locations. According to this assessment, permanent monitoring of water quality is mandatory at these important hydrological nodes, by analyzing the status and trends in physical and chemical characteristics of the surface water environment.
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