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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/pdfs/26/1/JEQ0260010200
Last checked: 12/12/2016
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| Publication Type:
| Refereed |
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| Author(s): | Michel, Frederick C. Jr.;
Reddy, C. Adinarayana;
Forney, Larry J. |
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| Author Affiliation: | NSF- Center for Microbial Ecology, and Dept. of Microbiology, Michigan State University |
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| Title: | Fate of carbon-14 diazinon during the composting of yard trimmings |
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| Section: | Biodegradation and bioremediation
Other records with the "Biodegradation and bioremediation" Section
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| Source: | Journal of Environmental Quality. Vol. 26, No. 1, January/February 1997, p. 200-205. |
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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: | 6 |
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| Keywords: | TIC Keywords: Bioremediation; Composting; Pesticides; Diazinon; Clippings; Biodegradation; Fate; Yard waste
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| Abstract/Contents: | "The fate of lawn care pesticides during the composting of yard trimmings is largely unknown. In this study we investigated the fate of diazinon (O, O-diethyl O-[2 isopropyl-6 methy-4-pyrimidinyl] phosphorothioate), the most widely used lawn care pesticide, during the composting of a mixture of leaves and grass (2:1 w/w). The yard trimmings were amended with [Δ-2-¹⁴C] labeled diazinon (10 mg kg⁻^D1 wet wt.) and composted in a laboratory scale compost system for 54 d. During composting, 48% of the initial total organic matter (OM) was lost as CO₂, the pH increased from 6.2 to 8.2, the oxygen uptake rate declined from 3.5 to 0.09 (mg 0₂ g OM⁻¹ h⁻¹), the humification index dropped from 1.0 to 0.37, and 11% of the ¹⁴C-diazinon was mineralized to ¹⁴CO₂. Initially most of the added ₁₄C-diazinon was ether extractable (83%) but < 1% was ether extractable after composting. A water extract of the finished compost contained 36% of the added ¹⁴C. Thin layer chromatography and mass spectrometry analyses of this water extract indicated that the ¹⁴C was in the form of 2-isopropyl-6-methyl 4-hydroxy pyrimidine (IMHP) a hydrolysis product of diazinon. The remaining ¹⁴C was either unextractable (32%), or was associated with a high molecular weight fraction of a 0.1M NaOH/Na₄P₂O₇ extract of the finished compost (19%). Volatilization of diazinon was negligible (0.2%). The results show that during the composting of yard trimmings, a relatively small amount of diazinon is mineralized to CO₂, while a majority of the diazinon is converted to potentially leachable, but less toxic IMHP, high molecular weight residues, and unextractable residues that are presumed to have low bioavailability." |
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| Language: | English |
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| References: | 23 |
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| See Also: | Other items relating to: COMFAT |
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| Note: | Figures
Tables
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Michel, F. C. Jr., C. A. Reddy, and L. J. Forney. 1997. Fate of carbon-14 diazinon during the composting of yard trimmings. J. Environ. Qual. 26(1):p. 200-205. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/pdfs/26/1/JEQ0260010200
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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