Journal article
Bioavailability and effect of pirimicarb on Daphnia magna in a laboratory freshwater/sediment system
In tests with newborn and one-week-old Daphnia magna, 48-h EC(50) values of 21-24 mu g/L and 16 mu g/L pirimicarb, respectively, were found. Older animals thus were as sensitive to pirimicarb as newborn animals. In an experiment with sediment included in the test system, all mother animals survived for 72 h at 20 mu g/L, and the number of offspring was not reduced relatively to the control.
Addition of sediment thus reduced the toxicity of pirimicarb toward Daphnia magna. Pirimicarb was accumulated 12-16 times (5-7% of total) in the sediment, but the water concentrations of pirimicarb were not reduced significantly during the experiment, due to the small amount of sediment used. Accumulation in the sediment was found independent of the water concentration used.
This was also the case with bioaccumulation in Daphnia magna, where a bioaccumulation factor of 31-37 was found on a dry weight basis. In water without sediment a BCF of 50 was found. Addition of sediment also reduced the accumulation of pirimicarb in the daphnids. The reduced bioavailability of pirimicarb may derive from humic acid and related compounds released from the sediment.
Language: | English |
---|---|
Publisher: | Springer-Verlag |
Year: | 1996 |
Pages: | 252-255 |
ISSN: | 14320703 and 00904341 |
Types: | Journal article |
DOI: | 10.1007/BF00212374 |
Agriculture Animals Biological Availability Carbamates Daphnia Denmark Ecology Environment Environment, general Female Forestry Fresh Water Geologic Sediments Insecticides Lethal Dose 50 Pesticide Residues Pyrimidines Soil Pollutants Soil Science & Conservation Terrestrial Pollution Toxicity Waste Management/Waste Technology Waste Water Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Water Concentration Water Management Water Pollutants, Chemical Water Pollution pirimicarb