||Biodegradation and Photolysis of Pentachlorophenol in Artificial Freshwater Streams.
Pignatello, J. J. ;
Martinson, M. M. ;
Steifert, J. G. ;
Carlson, R. E. ;
Crawford, R. L. ;
||Saint Olaf Coll., Northfield, MN.;Environmental Research Lab.-Duluth, MN.
Water pollution ;
Fresh water ;
Chlorine organic compounds ;
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The biodegradation, photolysis, and adsorption of pentachlorophenol (PCP) in outdoor, aquatic environments were examined with man-made channels built by the U.S. Environmental Protection Agency at a field station on the Mississippi River near Monticello, Minn. The authors monitored the biotic and abiotic degradation of PCP in these channels for approximately 16 weeks. Most of the PCP-mineralizing microorganisms that developed in the channels were either attached to surfaces (e.g., rocks and macrophytes) or associated with surface sediments. Total bacterial numbers (direct microscopic counts) in the various channels were not affected significantly by PCP concentrations of micrograms per liter. Numerous strains of bacteria able to grow at the expense of PCP were isolated from the adapted channels. The experiments reported here will help predict the responses of flowing aquatic ecosystems to contamination by biocides such as pentachlorophenol.