| Abstract: | The preferential dealkylation pathways of the s-triazine herbicides, atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine), propazine [2-chloro-4,6-bis(isopropylamino)-s-triazine], and simazine [2-chloro-4,6-bis(ethylamino)-s-triazine], and two monodealkylated triazine metabolites, deisopropylatrazine (DIA: 2-amino-4-chloro-6-ethylamino-s-triazine) and deethylatrazine (DEA: 2-amino-4-chloro-6-isopropylamino-s-triazine) were investigated on two adjacent Eudora silt-loam plots growing corn (Zea mays L.). Results from the shallow unsaturated zone and surface-water runoff showed preferential removal of an ethyl side chain from atrazine, simazine, and DIA relative to an isopropyl side chain from atrazine, propazine, and DEA. It is hypothesized that deethylation reactions may proceed at 2-3 times the rate of deisopropylation reactions. It is concluded that small concentrations of DIA reportedly associated with the degradation of atrazine may be due to a rapid turnover rate of the metabolite in the unsaturated zone, not to small production levels. Because of continued dealkylation of both monodealkylated metabolites, a strong argument is advanced for the presence of a didealkylated metabolite in the unsaturated zone. |
| Genre: | Article |
| ProdID: | 70017399 |
| Citation Author: | Mills, M. S.; Michael, Thurman, E. |
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| Citation End Page: | 605 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Science and Technology |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | Preferential dealkylation reactions of s-triazine herbicides in the unsaturated zone; 1994; Article; Journal; Environmental Science and Technology; Mills, M. S.; Michael, Thurman, E. |
| Citation Start Page: | 600 |
| Citation Volume: | 28 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Preferential dealkylation reactions of s-triazine herbicides in the unsaturated zone; 1994; Article; Journal; Environmental Science and Technology; Mills, M. S.; Michael, Thurman, E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1021/es00053a011 |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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