The toxicity of three highly volatile organic solvents - tetrachloroethane (Cl2HC-CHCl2), tetrachloroethylene (Cl2C=CCl2), trichloroethylene (ClHC=CCl2) - was studied on Unio crassus specimens. The tested chlorinated hydrocarbons sink to the bottom of standing water bodies due to their high density; therefore they represent an increased risk for benthic organisms. For a start, all three compounds were applied in 100% saturation. In the case of tetrachloroethylene and trichloroethylene all specimens died within a few days. In the case of tetrachloroethane the intoxication process was much faster, all the specimens died within 4 hours. Tetrachloroethane proved to be the most toxic compound; its diluted solutions were further tested: in the 5% solution all U. crassus specimens died after 24 hours. The 1% solution had a strong disturbing effect on the behaviour of the bivalves, which was gradually moderated and eventually stopped on the 33rd day. These results suggest that the examined chlorinated hydrocarbons are strongly toxic to living organisms even in aquatic medium and cause rapid death even in low concentrations.
|Number of pages||4|
|Journal||North-Western Journal of Zoology|
|Publication status||Published - Dec 2012|
- Chlorinated hydrocarbons
- Toxicity test
ASJC Scopus subject areas
- Animal Science and Zoology