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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.)

Evaluation of amicarbazone toxicity removal through degradation processes based on hydroxyl and sulfate radicals

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Author(s):
Graca, Catia A. L. [1] ; Maniero, Milena Guedes [2] ; de Andrade, Lidiane Maria [3] ; Guimaraes, Jose Roberto [2] ; Teixeira, Antonio Carlos S. C. [4]
Total Authors: 5
Affiliation:
[1] Univ Porto, LSRE, LCM, Fac Engn, Rua Dr Roberto Frias, P-4200465 Porto - Portugal
[2] Univ Estadual Campinas, Sch Civil Engn Architecture & Urban Design, Campinas, SP - Brazil
[3] Univ Sao Paulo, Dept Chem Engn, Sao Paulo - Brazil
[4] Univ Sao Paulo, Dept Chem Engn, Res Grp Adv Oxidat Proc AdOx, Sao Paulo - Brazil
Total Affiliations: 4
Document type: Journal article
Source: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING; v. 54, n. 11 JULY 2019.
Web of Science Citations: 0
Abstract

The herbicide amicarbazone (AMZ), which appeared as a possible alternative to atrazine, presents moderate environmental persistence and is unlikely to be removed by conventional water treatment techniques. Advanced oxidation processes (AOPs) driven by (OH)-O-center dot and/or SO4 center dot- radicals are then promising alternatives to AMZ-contaminated waters remediation, even though, in some cases, they can originate more toxic degradation products than the parent-compound. Therefore, assessing treated solutions toxicity prior to disposal is of extreme importance. In this study, the toxicity of AMZ solutions, before and after treatment with different (OH)-O-center dot-driven and SO4 center dot--driven AOPs, was evaluated for five different microorganisms: Vibrio fischeri, Chlorella vulgaris, Tetrahymena thermophila, Escherichia coli, and Bacillus subtilis. In general, the toxic response of AMZ was greatly affected by the addition of reactants, especially when persulfate (PS) and/or Fe(III)-carboxylate complexes were added. The modifications of this response after treatment were correlated with AMZ intermediates, which were identified by mass spectrometry. Thus, low molecular weight by-products, resulting from fast degradation kinetics, were associated with increased toxicity to bacteria and trophic effects to microalgae. These observations were compared with toxicological predictions given by a Structure-Activity Relationships software, which revealed to be fairly compatible with our empirical findings. (AU)

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: 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: 13/50218-2 - CEPEMA - Cooperative Center of Environmental Engineering
Grantee:Claudio Augusto Oller do Nascimento
Support type: Research Projects - Thematic Grants
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