Journal
CHEMOSPHERE
Volume 84, Issue 5, Pages 664-670Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2011.03.032
Keywords
Dunaliella salina; Toxicity; Trichlorfon; Dimehypo
Categories
Funding
- National Natural Foundation of China [30870025]
- China Postdoctoral Science Foundation [20080430826, 200801250]
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Dunaliella sauna, a unicellular green alga of environmental tolerance, was employed as test organism to investigate the toxicity effects of trichlorfon and dimehypo widely used in agriculture and veterinary as pesticides. The influences of trichlorfon and dimehypo on cell growth, beta-carotene level, cell morphology changes, and activities of superoxide dismutase (Sod) and catalase (Cat) were investigated. At the concentrations less than 0.050 g L(-1) trichlorfon or 0.0005 g L(-1) dimehypo, cell responses were similar to control. When treated with 0.075-0.100 g L(-1) trichlorfon or 0.001-0.004 g L(-1) dimehypo, cell growth and beta-carotene levels declined at first and then revived. When concentrations were higher than 0.125 g L(-1) trichlorfon or 0.005 g L(-1) dimehypo, both cell growth and beta-carotene levels decreased until they were undetectable. The 10-d IC50 of trichlorfon and dimehypo on D. salina were 0.179 g L(-1) and 0.032 g L(-1). Both pollutants could stimulate the increase of Cat activity at a low concentration. Tolerance of D. salina to trichlorfon was obviously higher than that of dimehypo. (C) 2011 Elsevier Ltd. All rights reserved.
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