Abstract
Short-term bioassay of chlorophenol compounds such as di- and pentachlorophenol (DCP and PCP) on the movement parameters and photosynthesis activity is tested using Euglena gracilis. Cells were exposed to different concentrations of 2,4-dichlorophenol (2,4-DCP) and pentachlorophenol (PCP) for different incubation times. Results of acute toxicity tests of cell motility showed that Euglena was highly sensitive to PCP after direct exposure in comparison to 2,4-DCP (