Journal article
Biodegradation of 2,4-D in a noncontaminated grassland soil profile
Journal of Environmental Quality, Vol.27(6), pp.1464-1471
1998
Abstract
Prediction of groundwater contamination and the development of rational bioremediation strategies require a greater understanding of xenobiotic biodegradation at the soil profile scale. We studied 2,4- dichlorophenoxyacetic acid (2,4-D) biodegradation for up to 83 d in soil samples collected in 10-cm depth increments from a noncontaminated soil profile (0-50 cm), and examined factors that influenced biodegradation in the subsoil (40-50 cm). For the four samples collected from 0 to 40 cm, total evolution of 14CO2 from 14C-ring-U-L2,4-D (20 mg kg-1, 0.25 MBq kg- 1) was 50.02 to 60.46% (maximum rate = 4.84% d-1 at 10-20 cm) at the end of the mineralization phase. Subsoil (40-50 cm) mineralization was either 5.47% (maximum rate = 0.113% d-1) or 56.1% (maximum rate = 2.67% d-1) after 83 d. Enhanced mineralization of successive 2,4-D applications was recorded in all topsoil (0-10 cm) samples and in the subsoil replicates that initially mineralized > 50%. Measurements of 2,4-D disappearance and most probable number analysis corresponded well with the biodegradation data. Inoculation of subsoil with topsoil (10%) increased 2,4-D mineralization in the 5% soil to > 50%, whereas amendment with N, P, K, and/or organic C sources (acetate, catechol, vanillin, 3,5-dihydroxybenzoic acid) did not. We conclude that the subsoil contained a low number of unevenly distributed microorganisms capable of using 2,4-D as a source of C and energy such that not all the subsamples had competent microorganisms present.
Details
- Title
- Biodegradation of 2,4-D in a noncontaminated grassland soil profile
- Authors
- L J Shaw (Author) - University of Kent, United KingdomRichard G Burns (Author) - University of Kent, United Kingdom
- Publication details
- Journal of Environmental Quality, Vol.27(6), pp.1464-1471
- Publisher
- American Society of Agronomy, Inc.
- Date published
- 1998
- DOI
- 10.2134/jeq1998.00472425002700060024x
- ISSN
- 0047-2425
- Organisation Unit
- University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
- Language
- English
- Record Identifier
- 99449408402621
- Output Type
- Journal article
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