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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/pdfs/24/4/JEQ0240040564
Last checked: 12/12/2016
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| Publication Type:
| Refereed |
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| Author(s): | Pivetz, B. E.;
Steenhuis, T. S. |
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| Author Affiliation: | ManTech Environmental Research Service Corp., Ada, OK; Department of Agricultural and Biological Engineering, Cornell University, Ithaca, NY 14853 |
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| Title: | Biodegradation and bioremediation: Soil matrix and macropore biodegradation of 2,4-D |
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| Source: | Journal of Environmental Quality. Vol. 24, No. 4, July/August 1995, p. 564-570. |
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| Publishing Information: | Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Vadose zone water; Biodegradation; Soils; Macropores; 2,4-D; Groundwater contamination; Oxygen; Nutrients; Earthworms; Pesticides; Application rates
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| Abstract/Contents: | "Preferential flow of pesticides in macropores can lead to decreased travel times through the vadose zone and increased groundwater contamination. Macropores, however, may present a favorable environment for biodegradation because of greater oxygen, nutrient, and substrate supply, and higher microbial populations in earthworm burrows, compared to the soil matrix. The biodegradation of 2,4-dichlorophenoxyacetic acid (2,4-D) was measured in macropores and soil matrix of packed soil columns (7.0-cm diam., 10-cm length) and undisturbed soil cores (10-cm diam., 7.3 or 8.0-cm length). Each packed column contained a well-defined artificial macropore and the undisturbed cores contained earthworm-burrow macropores. A 50 μg/L 2,4-D solution was continously applied to the unsaturated soil surface and breakthrough curves (BTCs) indicationg pesticide loss in the effluent were obtained from the soil matrix and macropore flow paths. Biodegradation rates were calculated separately for each flow path by comparing the BTCs to BTCs representing abiotic conditions, and dividing the 2,4-D loss by the travel time through each flow path. The biodegradation rates increased with time in both flow paths, and the final biodegradation rate in the macropore region surpassed that of the matrix, presumably because of incresed microbial populations in the macropore. Complete loss of the 2,4-D in both flow paths was observed after continuous application of 2,4-D for 400 h, with maximum column-averaged 2,4-D loss rates of 0.879 μg/(L h) in the matrix and 1.073 μg/(L h) in the macropore. Biodegradation of 2,4-D was also observed in the macropore and matrix regions of the undisturbed soil cores." |
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| Language: | English |
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| References: | 19 |
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| See Also: | Other items relating to: 2, 4 - D in Turf |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Pivetz, B. E., and T. S. Steenhuis. 1995. Biodegradation and bioremediation: Soil matrix and macropore biodegradation of 2,4-D. J. Environ. Qual. 24(4):p. 564-570. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/pdfs/24/4/JEQ0240040564
Last checked: 12/12/2016
Requires: PDF Reader
Notes: Item is within a limited-access website |
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MSU catalog number: S 900 .J6 |
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