Degradability of polychlorinated phenols by bacterial populations in soil |
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| Affiliation: | 1. Biotechnology Laboratory, Department of Applied Chemistry, Faculty of Engineering, Okayama University of Science, 1-1 Ridai-cho, Okayama 700, Japan;2. Hiruzen Research Institute, Okayama University of Science, 1-1 Ridai-cho, Okayama 700, Japan;1. Institute of Pesticide & Environmental Toxicology, Zhejiang University, Hangzhou, China;2. Center for Drug Design, Academic Health Center, University of Minnesota, Minneapolis, USA;3. School of Agricultural and Food Science, Zhejiang A&F University, Hangzhou, China;1. Department of Chemistry, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China;2. Toxikon Corporation, 15 Wiggins Ave, Bedford, MA 01730, USA;3. Department of Materials Chemistry, School of Life Science, Huzhou Teachers college, Huzhou 313000, PR China;1. Group Health Research Institute, Seattle, Washington;2. Department of Epidemiology, University of Washington, Seattle, Washington;3. Department of Biostatistics, University of Washington, Seattle, Washington;4. School of Pharmacy, University of Washington, Seattle, Washington |
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| Abstract: | The biodegradabilities of polychlorinated phenols including 5 isomers of trichlorophenols, 3 isomers of tetrachlorophenols and pentachlorophenol, were tested with 170 samples of soil collected from various environments. After the samples were inoculated into a succinate-containing mineral medium and incubated, the cultures were acclimatized to phenol concentrations from 10 to 100 ppm. Twenty six samples (15%) were observed to degrade 2, 4, 6-trichlorophenol (246TrCP) and a mixed sample of soil degraded 2, 3, 4, 6-tetrachlorophenol, but no degradation was seen with other chlorophenols. All of the mixed cultures acclimatized to and degrading 246TrCP also degraded phenol. For the degradation of 246TrCP, the NO3′ ion was preferred to the NH4+ ion as a nitrogen source. At concentrations below 500 ppm, 246TrCP was degraded completely within 8 d and the chloride ion was detected in the culture broth at an amount corresponding to that of the chlorinated phenol, although cell growth was inhibited at a 246TrCP concentration of 1,000 ppm. No possible intermediate product of 246TrCP was detected in the cultures. |
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