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CHANGE OF SOIL-S ENZYMATIC ACTIVITY AT POLLUTION BY ANTIBIOTICS
Abstract
In recent years, the input of antibiotics into soils has sharply increased. The environmental behavior of antibiotics is not well known and the precise environmental risk assessment is not practical. Long-term studies have shown the efficiency of the diagnostics and monitoring of soils with biochemical methods, particularly with the help of the indices of soil enzymatic activity. We studied the impact antibiotics (benzylpenicillin, tilosin and nystatin) at different concentrations (100, 500 mg/kg) on hydrolase (phosphatase and invertase) and oxidoreductase (catalase and dehydrogenase) activities in model experiments. The applied doses of antibiotics had definite suppressing effects on the soil enzymatic activity (20-70% of the control). Among the studied enzymes belonging to oxidoreductases and hydrolases, catalase and phosphatase had the highest and the lowest resistance to the antibiotics, respectively. The effect of antibiotics on enzymatic activity of soil lasted for a long time. The studied parameters were not completely recovered in 120 days.
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