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Photodegradation of bromacil and terbacil by ultraviolet radiation
| Title: | Photodegradation of bromacil and terbacil by ultraviolet radiation. |
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| Name(s): |
Johnson, Hannah Kalyani Florida Atlantic University, Degree grantor Parkanyi, Cyril, Thesis advisor Charles E. Schmidt College of Science Department of Chemistry and Biochemistry |
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| Type of Resource: | text | |
| Genre: | Electronic Thesis Or Dissertation | |
| Issuance: | monographic | |
| Date Issued: | 1993 | |
| Publisher: | Florida Atlantic University | |
| Place of Publication: | Boca Raton, FL | |
| Physical Form: | application/pdf | |
| Extent: | 87 p. | |
| Language(s): | English | |
| Summary: | The photodegradation of bromacil (5-bromo-3-sec-butyl-6-methyluracil) and terbacil (5-chloro-3-tert-butyl-6-methyluracil) by ultraviolet radiation has been investigated. Irradiation of aerated aqueous solutions of the title compounds (25 ppm), led to fast degradation of both. The reactions were found to follow first order kinetics with rate constants 5.77x10^-1 hr^-1 in the case of bromacil and 8.45x10^-2 hr^-1 in the case of terbacil. Degradation in ethanol and cyclohexane was also studied, but the solutions were not analyzed for photoproducts. The photoreaction mixture of both the herbicides in water showed four peaks on GC, indicating four photoproducts. Loss of halogens from the heterocyclic ring has been observed as shown by the presence of Br- in the case of bromacil and Cl- in the case of terbacil in the photoreaction solution. 6-Methyluracil which was isolated from the aqueous fraction of the photoreaction mixture was the common photoproduct from both bromacil and terbacil. From the organic fractions 3-sec-butyl-5-acetyl-5-hydroxyhydantoin was identified in the case of bromacil and 3-tert-butyl-5-acetyl-5-hydroxyhydantoin in the case of terbacil. The other two photoproducts were left unidentified. | |
| Identifier: | 14929 (digitool), FADT14929 (IID), fau:11711 (fedora) | |
| Degree granted: | Thesis (M.S.)--Florida Atlantic University, 1993. | |
| Collection: | FAU Electronic Theses and Dissertations Collection | |
| Note(s): | Charles E. Schmidt College of Science | |
| Subject(s): |
Ultraviolet radiation Photochemistry--Deterioration Herbicides Uracil |
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| Held by: | Florida Atlantic University Libraries | |
| Persistent Link to This Record: | http://purl.flvc.org/fcla/dt/14929 | |
| Sublocation: | Digital Library | |
| Use and Reproduction: | Copyright © is held by the author with permission granted to Florida Atlantic University to digitize, archive and distribute this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder. | |
| Use and Reproduction: | http://rightsstatements.org/vocab/InC/1.0/ | |
| Host Institution: | FAU | |
| Is Part of Series: | Florida Atlantic University Digital Library Collections. |
