ECOTOXICOLOGICAL ASSESSMENT OF TABACARIE LAKE

The ecological characteristics of Tabacarie Lake on the Romanian Black Sea coast have undergone changes over time due to the pressure of the anthropic activities in the area. This requires assessment of the aquatic toxicity level. An ecotoxicological assessment of Tabacarie Lake effluent in the Black-Sea was done using 72 h Algaltoxkit biotest.

The tests were performed using serial dilutions method, by halving the concentration, on some water samples from Tabacarie Lake. The ecotoxicological endpoints was the growth of green algae Pseudokirchneriella subcapitata.

The highest inhibition of algal growth, with a value of 17.7%, was recorded in the tests with 100% Tabacarie water concentration, after 24 h measurement. The lowest inhibition was recorded in the test with the lowest concentration of lake water (6.25%). Tests have revealed that at different low concentrations of pollutants, the difference between effects decreases over time and at different high concentrations of pollutants, the difference between effects increases over time.