Enzymological studies regarding the present of the sediments in Bega channel

The sediment tests from the Bega canal were quantitatively and enzymologicaly studied. The following enzymological activities were determined: actual and potential dehydrogenase, catalase, urease and the reductive capacity of the FeIII. The sediment test was made in every season, during the year of 2006 in 4 drawing point levels Ghiroda, Uzina de ap downstream, Iosefin and Timi oara downstream. The studied enzymatic activities were taken under the form of complete values. Based on this the enzymatic indicator of the sediments` quality was determined (EISQ).This indicator has seasonal variations and it depends on the drawing points of the tests. The recorded values for the studied enzymatic activities are very different, because of the existence in the drawing point of a certain stimulative or inhibitory element of the enzymatic activity. Waters containing a high level of urea, nitrate and nitrite have a stimulative effect on the urease activity. The present and possible dehydrogenase activity has an important decrease in certain zones. This happens because the water from the Bega Canal has been cleaned from a toxic pollution found in the domestic and especially industrial waste waters (some heavy metals from specialized factories). Based on the EISQ values certain pollution sources were identified which have a destructive effect on the communities of the microorganism and organism from the water and the sediment in the Bega Canal.