Photodegradation of sulfonamide antibiotics in simulated and natural sunlight: Implications for their environmental fate |
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| Authors: | Sudha Rani Batchu Venkata R Panditi Piero R Gardinali |
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| Institution: | 1. Department of Chemistry and Biochemistry , Florida International University , Miami , Florida , USA;2. Southeast Environmental Research Center (SERC) , Florida International University , Miami , Florida , USA;3. Department of Chemistry and Biochemistry , Florida International University , Miami , Florida , USA |
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| Abstract: | 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 254 nm 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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| Keywords: | Photodegradation sulfonamides antibiotics simulated solar radiation natural sunlight UV pharmaceuticals rate constant quantum yield canal water salt water |
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