hydrochemical features and the water quality of the fluvial lakes from the south – west of dobrudja

Hydrochemical features and the water quality of the fluvial lakes from the south – west of Dobrudja. The evidence of the hydrochemical features and the water quality of the fluvial lakes is based on the processing of data concerning chemical parameters for the years 1996 – 2008. The values of the chemical parameters have been analysed and fit according to the Order 161/2006. The ionic composition of the fluvial lakes ranged between 412.2 mg/L – 928.17 mg/L and is characterized almost 65% by prevailing of the bicarbonate anion. The magnesium ion (38.32 mg/l – 4.76 mg/l) contributes to the mineralization of the water with great values compared to the values of the calcium ion (37.20 mg/l – 31.83 mg/l). But the concentration of chlorine (50.76 – 148.25 mg/l ) and sulfate (40.15 – 95.41 mg/l) anions is higher than magnesium and calcium cations. The mean values of the dissolved oxygen ranged between 7.32 mg O2/l and 9.78 mg O2/l. The potential for hydrogen ion concentration has values between 7.8 and 8.5 so the fluvial lakes are alkaline and are favorable for the growth of animal and vegetable organisms. These fluvial lakes have fresh water and they are used in pisciculture.