The modifying effect of natural waters on the toxicity of heavy metals for algae Chlorella vulgaris

The character of the effect of heavy metals (copper, zinc, and cadmium) on a test-culture of chlorella algae in natural waters (the Yenisei and Kacha rivers) is studied. The toxicity of metals in samples of those waters can decrease significantly. The extent of decrease in the toxic effect of the examined pollutants depends on the type of the tested water and significantly varies over time.