Reaction kinetics and mechanisms of organosilicon fungicide flusilazole with sulfate and hydroxyl radicals
| Autor: | Antonio Arques, Mónica C. Gonzalez, Paula Caregnato, Larisa L. B. Bracco, D. Fabio Mercado |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Free Radicals Health Toxicology and Mutagenesis Radical 02 engineering and technology 010501 environmental sciences Photochemistry 01 natural sciences Flusilazole Chemical kinetics chemistry.chemical_compound Reaction rate constant photo-fenton Environmental Chemistry fungicide degradation Hydrogen peroxide Ciencias Exactas 0105 earth and related environmental sciences 2. Zero hunger Photolysis hydroxyl radical Sulfates Otras Ciencias Químicas Photodissociation Ciencias Químicas Public Health Environmental and Occupational Health Física Hydrogen Peroxide General Medicine General Chemistry Química Silanes Triazoles 021001 nanoscience & nanotechnology degradation mechanism Pollution Fungicides Industrial 3. Good health Kinetics chemistry flusilazole Flash photolysis sulfate radical Hydroxyl radical 0210 nano-technology CIENCIAS NATURALES Y EXACTAS QUIMICA FISICA |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| Popis: | 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 × 109 s-1M-1 for the reaction of the fungicide with HO· and 4.6 × 108 s-1 M-1 for the same reaction with SO4·⁻ radicals. The absorption spectra of organic intermediates detected by laser flash photolysis of S2O2/8⁻ 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. Facultad de Ciencias Exactas Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas |
| Databáze: | OpenAIRE |
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