Ecotoxicological assessment of surface waters from the territory of radioactive waste storage (Vodny, Komi Republic) using duckweed (Lemna minor L.)

The results of toxicity assessment of natural waters from the radioactive waste storage territory of the village Vodny of the Republic of Komi ate given. Duck- weed laboratory cultures (Lemna minor L.) as the test object are presented. Active water samples correspond to NRB-99. Despite this, water from the storage reservoir causes 50% reduction in specific growth rate in laboratory culture, the increase in proportion of damaged plants compared to control. Experiments confirmed that the toxicity of water to duckweed is caused by heavy metals (stron- tium, zinc, barium), deficiency of potassium.