Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals
Flusilazole is an organosilane fungicide used for treatments in agriculture and horticulture for control of diseases. The reaction kinetics and mechanism of flusilazole with sulfate and hydroxyl radicals were studied. The rate constant of the radicals with the fungicide were determined by laser flas...
Guardado en:
| Autores principales: | , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2018
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/107000 https://www.sciencedirect.com/science/article/abs/pii/S0045653517315618 |
| Aporte de: |
| id |
I19-R120-10915-107000 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Física Química flusilazole fungicide degradation degradation mechanism sulfate radical hydroxyl radical photo-fenton |
| spellingShingle |
Ciencias Exactas Física Química flusilazole fungicide degradation degradation mechanism sulfate radical hydroxyl radical photo-fenton Mercado Castro, Donaldo Fabio Bracco, Larisa L. B. Arques, Antonio González, Mónica Cristina Caregnato, Paula Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals |
| topic_facet |
Ciencias Exactas Física Química flusilazole fungicide degradation degradation mechanism sulfate radical hydroxyl radical photo-fenton |
| description |
Flusilazole is an organosilane fungicide used for treatments in agriculture and horticulture for control of diseases. The reaction kinetics and mechanism of flusilazole with sulfate and hydroxyl radicals were studied. The rate constant of the radicals with the fungicide were determined by laser flash photolysis of peroxodisulfate and hydrogen peroxide. The results were 2.0 × 10<sup>9</sup> s<sup>-1</sup>M<sup>-1</sup> for the reaction of the fungicide with HO· and 4.6 × 10<sup>8</sup> s<sup>-1</sup> M<sup>-1</sup> for the same reaction with SO<sub>4</sub>·⁻ radicals. The absorption spectra of organic intermediates detected by laser flash photolysis of S<sub>2</sub>O2/8⁻ with flusilazole, were identified as α-aminoalkyl and siloxyl radicals and agree very well with those estimated employing the time-dependent density functional theory with explicit account for bulk solvent effects. In the continuous photolysis experiments, performed by photo-Fenton reaction of the fungicide, the main degradation products were: (bis(4-fluorophenyl)-hydroxy-methylsilane) and the non-toxic silicic acid, diethyl bis(trimethylsilyl) ester, in ten and twenty minutes of reaction, respectively. |
| format |
Articulo Articulo |
| author |
Mercado Castro, Donaldo Fabio Bracco, Larisa L. B. Arques, Antonio González, Mónica Cristina Caregnato, Paula |
| author_facet |
Mercado Castro, Donaldo Fabio Bracco, Larisa L. B. Arques, Antonio González, Mónica Cristina Caregnato, Paula |
| author_sort |
Mercado Castro, Donaldo Fabio |
| title |
Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals |
| title_short |
Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals |
| title_full |
Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals |
| title_fullStr |
Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals |
| title_full_unstemmed |
Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals |
| title_sort |
reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals |
| publishDate |
2018 |
| url |
http://sedici.unlp.edu.ar/handle/10915/107000 https://www.sciencedirect.com/science/article/abs/pii/S0045653517315618 |
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AT mercadocastrodonaldofabio reactionkineticsandmechanismsoforganosiliconfungicideflusilazolewithsulfateandhydroxylradicals AT braccolarisalb reactionkineticsandmechanismsoforganosiliconfungicideflusilazolewithsulfateandhydroxylradicals AT arquesantonio reactionkineticsandmechanismsoforganosiliconfungicideflusilazolewithsulfateandhydroxylradicals AT gonzalezmonicacristina reactionkineticsandmechanismsoforganosiliconfungicideflusilazolewithsulfateandhydroxylradicals AT caregnatopaula reactionkineticsandmechanismsoforganosiliconfungicideflusilazolewithsulfateandhydroxylradicals |
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Repositorios |
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1764820443554906113 |