1. Influence of pH value on sulfonamide ozonation using caffeine as a contamination indicator
- Author
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José Roberto Guimarães, Milena Guedes Maniero, and Glenda Araujo S. Gireli
- Subjects
chemistry.chemical_classification ,Chromatography ,02 engineering and technology ,010501 environmental sciences ,Contamination ,021001 nanoscience & nanotechnology ,01 natural sciences ,Sulfonamide ,chemistry.chemical_compound ,chemistry ,0210 nano-technology ,Caffeine ,Value (mathematics) ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
Ozonation was effective in degrading six sulfonamides: sulfaquinoxaline, sulfamethazine, sulfamethoxazole, sulfathiazole, sulfadimethoxine, and sulfadiazine (C0 = 100 μg L−1). The degradation experiments were based on two variables: pH (3.0, 7.0 and 11.0) and aqueous matrix (ultrapure water, tap water, and surface water). In all matrices studied and pH 11.0, more than 99% of the drugs were degraded with the highest applied ozone dose (65 mg L−1), when compared with other pH values. Also, comparing the three aqueous matrices, the ultrapure water was the one that required the lowest ozone dosage (6.4 mg L−1) to reach the same degradation efficiency of the sulfonamides. Caffeine is known as an environment contamination indicator. Therefore, this does not intend to totally remove this compound, but to verify its degradation level compared with the sulfonamides.
- Published
- 2019
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