Journal
ECOTOXICOLOGY
Volume 21, Issue 7, Pages 1957-1964Publisher
SPRINGER
DOI: 10.1007/s10646-012-0930-3
Keywords
Euglena gracilis; Ariel detergent; Chlorophyll; Motility; Photosynthesis; Toxicity
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Funding
- Kohat University of Science and Technology (KUST) Kohat, Khyber Pakhtunkhwa, Pakistan
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Chronic toxicity of the common laundry detergent Ariel on the freshwater alga Euglena gracilis was investigated by growing the alga in a medium containing the detergent for 7 days. Cell density, motility, swimming velocity, gravitactic orientation, cell shape, photosynthesis and concentration of light-harvesting pigments were used as end point parameters for the assessment of toxicity. Cell density was significantly reduced at a concentration of 1 mg l(-1) or above. Among the other tested parameters, with the exception of cell shape, gravitaxis and chlorophyll b, all were adversely affected by the detergent at concentrations exceeding 1 mg l(-1). It is concluded that long-term (7-days) exposure to the detergent caused significant toxicity to E. gracilis. Furthermore, long-term tests with E. gracilis can be used as sensitive indicator for the toxicity assessment of laundry detergents in aquatic environments.
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