Microbial release of 2,4-dichlorophenyl bound to humic acid or incorporated during humification
- Pennsylvania State Univ., University Park (USA)
The microbial release of {sup 14}C-labeled 2,4-dichlorophenol (DCP) bound to synthetic and natural humic materials or polymerized by enzymes was investigated to evaluate the possibility of future adverse effects if binding or polymerization is used for decontamination purposes. After 12 wk of incubation with microorganisms obtained from a forest soil, the amounts of substances released into the media were very small (maximum 2.2% of the initially bound {sup 14}C) without regard to the kind of the polymer into which {sup 14}C-DCP was incorporated. Most of the radioactivity (46.2 to 80.8%) remained bound to the precipitated humic materials or in the DCP-polymer (90.1 to 97.0%). Certain amounts of the released substances evolved in the form of {sup 14}CO{sub 2} (1.0 to 9.4% from humic materials and 0 to 0.5% from a DCP-polymer). The rate of mineralization differed depending on the type of DCP binding - surface-bound or incorporated during synthesis of humic acid - and on the kind of polymer to which {sup 14}C-DCP was attached. The release into the media and {sup 14}CO{sub 2} evolution for synthetic and natural humic acids was essentially the same. When only DCP was present in the growth medium, the formation of {sup 14}CO{sub 2} was less than from a DCP-humic acid complex; this may indicate that {sup 14}CO{sub 2} from a DCP-humic acid complex originated mostly from DCP derivatives. The data obtained for DCP did not provide any evidence for a delayed pollution problem associated with polymerization or binding of xenobiotics to humic acids.
- OSTI ID:
- 5327267
- Journal Information:
- Journal of Environmental Quality; (United States), Journal Name: Journal of Environmental Quality; (United States) Vol. 19:3; ISSN JEVQA; ISSN 0047-2425
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540211* -- Environment
Terrestrial-- Basic Studies-- Radiometric Techniques-- (1990-)
AROMATICS
BIODEGRADATION
CARBON 14 COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CLEANING
CONTAMINATION
DECOMPOSITION
DECONTAMINATION
HUMIC ACIDS
HUMUS
HYDROXY COMPOUNDS
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MICROORGANISMS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHENOLS
POLYMERS
SOIL CHEMISTRY
TRACER TECHNIQUES
XENOBIOTICS