Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 49, Issue 3, Pages 200-211Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2014.858574
Keywords
Photodegradation; sulfonamides; antibiotics; simulated solar radiation; natural sunlight; UV; pharmaceuticals; rate constant; quantum yield; canal water; salt water
Funding
- Thermo Scientific Corporation
- Florida International University graduate school
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The photochemical fate of seven sulfonamides was investigated in matrices representative of natural water bodies under various light sources. Fundamental photolysis parameters such as molar absorption coefficient, quantum yield (QY) and first-order rate constants were determined. The photolysis decay rate was dependent on the protonation state of the molecule, pH of the water sample and dissolved organic matter. Natural organic matter was the most significant factor in the indirect photolysis of sulfonamides. Half-lives were in the range of minutes at 254nm to days under natural sunlight. Under natural sunlight, all sulfonamides showed higher removal rates in natural waters implying that indirect photolysis is the predominant mechanism.
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