Degradation of Dimilin® by Aquatic Foodwebs
The purpose of this report was to analyze several components of the food web of a lake and pond ecosystem. Specifically, the degradation and accumulation properties of Dimilin (a 25% wettable powder formulation of TH-6040, N-[[(4 chlorophenyl)amino] carbonyl] benzamide) were studied in a model system with water, soil, aquatic vegetation, algae, bacteria, and channel catfish. Following multiple application, Dimilin disappeared from water, sediment, and aquatic vegetation after several days.
Algae (Plectonema) degraded 80% of the TH-6040 in a 1 hour incubation period primarily to p-chlorophenyl urea and p-chloroaniline.
Pseudomonas sp. accumulated rather large amounts of TH-6040 from the incubation media when the chemical was used as the sole carbon source; however, no degradation products were detected in the media. Some metabolism occurred when an acetate carbon source was placed in the incubation flasks with the organisms and chemical.
Channel catfish did not bioaccumulate Dimilin residues from treated soil in a simulated lake ecosystem constructed in the laboratory.
KeywordsHigh Pressure Liquid Chromatography Aquatic Vegetation Channel Catfish Aquatic FOODWEBS Uptake Period
Unable to display preview. Download preview PDF.
- Craig, R.B. and R.L. Rudd. 1974. In: “Survival in Toxic Environments.” M.A.Q. Khan and John P. Bederka, Jr. (eds.) p. 1–24. Academic Press, New York.Google Scholar
- Gerakis, P.A. and A.G. Sficas. 1974. In: “Pesticide Review.” F.A. Gunther and J.D. Gunther (eds.) p. 69–88. Springer-Verlag, New York.Google Scholar
- Ketchum, B.H. 1974. In: “Ecological Toxicology Research.” A.D. McIntyre and C.F. Mills (eds.) p. 285–300. Plenum Press, New York.Google Scholar
- Miura, T. and M.M. Takahashi. 1975. Mosg. News. 35 (2): 154–159.Google Scholar
- Nulla, N.S., G. Majori, and H.A. Darwazeh. 1975. Mosg. News. 35 (2): 211–216.Google Scholar
- Schaefer, C.H. and E.F. Dupras, Jr. 1976. J. Ag. Fd. Chem. Submitted manuscript.Google Scholar