Biogenic volatile organic compounds as a potential stimulator for organic contaminant degradation by soil microorganisms.
The effects of monoterpenes on the degradation of (14)C-2,4-dichlorophenol (DCP) were investigated in soils collected from areas surrounding monoterpene and non-monoterpene-emitting vegetation. Indigenous microorganisms degraded (14)C-2,4-DCP to (14)CO(2), after 1d contact time. Degradation was enhanced by prior exposure of the soils to 2,4-DCP for 32 d, increasing extents of mineralisation up to 60%. Monoterpene amendments further enhanced 2,4-DCP degradation, but only following pre-exposure to both 2,4-DCP and monoterpene, with total 2,4-DCP mineralisation extents of up to 71%. Degradation was greatest at the higher monoterpene concentrations (> or = 1 microg kg(-1)). Total mineralisation extents were similar between concentrations, but higher than the control and the 0.1 microg kg(-1) amendment, indicating that increases in monoterpene concentration has a diminishing enhancing effect. We suggest that monoterpenes can stimulate the biodegradation of 2,4-DCP by indigenous soil microorganisms and that monoterpene amendment in soils is an effective strategy for removing organic contaminants.
McLoughlin
Emma
E
Department of Environmental Science, Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK.
Rhodes
Angela H
AH
Owen
Susan M
SM
Semple
Kirk T
KT
D001673:Biodegradation, Environmental; D018533:Biomass; D002250:Carbon Radioisotopes; D002384:Catalysis; D002733:Chlorophenols / Q000378:metabolism*; D004463:Ecology / Q000379:methods; D052918:Environmental Restoration and Remediation / Q000379:methods*; D008129:Lolium / Q000378:metabolism; D039821:Monoterpenes / Q000494:pharmacology*; D006109:Poaceae / Q000378:metabolism; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D055549:Volatile Organic Compounds / Q000494:pharmacology*
D002250:Carbon Radioisotopes; D002733:Chlorophenols; D039821:Monoterpenes; D012989:Soil Pollutants; D055549:Volatile Organic Compounds; C004762:2,4-dichlorophenol