Assessment of the quality of the Danube delta aquatic ecosystem - Surface water and sediment

The main objective of this paper is to provide data on the Danube delta aquatic ecosystem quality (surface water and sediment). The samples were collected during the period May-October of the two consecutive years: 2005 and 2006 from Uzlina and Murighiol locations situated on Sf. Gheorghe branch. High concentration of PAH's compounds were recorded in Murighiol sediments and represents a significant pollution of the quality of sediment. The comparative analysis (physicochemical determinations) of the quality characteristics of the Danube delta aquatic ecosystem in these two years emphasised a dynamic character of the water quality that can determine an evolution into the unfavourable stages, which lead to worsen life conditions for aquatic organisms.