US EPA

2179900 

Journal Article 

Pick-up and metabolism of DDT, dieldrin and photodieldrin by a fresh water alga (Ankistrodesmus amalloides) and a microcrustacean (Daphnia pulex) 

Neudorf, S; Khan, MA 

1975 

Yes 

Bulletin of Environmental Contamination and Toxicology
ISSN: 0007-4861
EISSN: 1432-0800 

PESTAB/75/1910 

13 

4 

443-450 

English 

1131449 

https://search.proquest.com/docview/45783731?accountid=171501
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PESTAB. The unicellular freshwater alga, Ankistrodesmus amalloides, and the microcrustacean, Daphnia pulex, were grown in the presence of 0.72 ppb 14C-DDT, 14C-dieldrin, or 14C-photodieldrin, and the absorption/adsorption and metabolism of the pesticides measured using scintillation spectrometry and thin-layer chromatography. Over a 1-3 hr period, the total pick-up of DDT by A. amalloides was 2.5 times that of dieldrin and 10 times that of photodieldrin; these differences seem to be related to the water solubilities of the insecticides. The efficiency with which each cell picked up the insecticides decreased with increasing cell density. The time required for maximum absorption was 120 min for DDT, 30-60 min for dieldrin, and 30 min for photodieldrin. Dieldrin was biologically magnified 2-3 times less and photodieldrin about 6 times less than DDT in A. amalloides. The alga metabolized DDT to DDE (3.5%) and DDD (TDE) (0.8%). Daphnia pulex showed about 13.6% conversion of DDT to DDE, with no other DDT metabolites being detected in this species. 

article; Animals; Carbon Radioisotopes; Daphnia; Dichlorodiphenyl Dichloroethylene; Dichlorodiphenyldichloroethane; Dieldrin; Eukaryota; Photochemistry; Time Factors; pesticides