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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of pH and ozone dose on sulfaquinoxaline ozonation

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Urbano, Vanessa Ribeiro ; Maniero, Milena Guedes ; Perez-Moya, Montserrat ; Guimaraes, Jose Roberto
Total Authors: 4
Document type: Journal article
Source: Journal of Environmental Management; v. 195, n. 2, SI, p. 224-231, JUN 15 2017.
Web of Science Citations: 20

Sulfaquinoxaline (SQX) is an antimicrobial of the sulfonamides class. Usually employed in veterinary medicine, this contaminant of emerging concern has been found in superficial and groundwater and its consequences for the environment and human health are not completely known. In this study, SQX (C-0 = 500 mu g L-1,1 L) degradation by an ozonation process at pH 3, 7, and 11 was evaluated. Ozonation was effective in degrading SQX: efficiency exceeding 99% was obtained applying an ozone dose of 2.8 mg L-1 at pH 3. Assays were performed according to a 22 design of experiments (DOE) with star points and three central points for statistical validity. Minimum and maximum levels were set at 3 and 11 for pH, and 0 and 11.5 mg L-1 for applied ozone dose. There was no significant interaction between these variables, and the pH value played the most important role in terms of contaminant degradation. In relation to toxicity, samples ozonated at pH 3 did not inhibit the luminescence of the bacteria, even though different intermediates were formed and identified by mass spectra. At pH 7, inhibition of luminescence remained almost constant (at around 30%) according to ozonation time or ozone dose. However, the hydroxyl radical, the major oxidant at pH 11, was responsible for the formation of toxic intermediates. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 13/04656-8 - Degradation of pharmaceuticals by peroxidation combined with ultraviolet radiation and ozonation: antimicrobial activity and toxicity
Grantee:José Roberto Guimarães
Support type: Regular Research Grants
FAPESP's process: 13/09543-7 - Residues of veterinary drugs in the environment
Grantee:Susanne Rath
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/06064-3 - Multi-User Equipment aproved in grant 2013/09543-7: ultra high performance liquid chromatography with photodiode array detector and Fluorescence Detector (UPLC-DAD-FLD)
Grantee:Susanne Rath
Support type: Multi-user Equipment Program
FAPESP's process: 13/07817-2 - Degradation of sulfonamides and tetraciclines by UV/H2O2 and O3: evaluation of antimicrobial activity and toxicity
Grantee:Milena Guedes Maniero Ferreira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/06201-0 - Multi-equipment aproved in grant 2013/09543-7: ultra high performance liquid chromatograph coupled to a photodiode array detector and tandem mass spectrometer (UPLC-DAD-MS/MS)
Grantee:Susanne Rath
Support type: Multi-user Equipment Program