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

Autor(es)

Graca, Catia A. L. ^[1] ; Maniero, Milena Guedes ^[2] ; de Andrade, Lidiane Maria ^[3] ; Guimaraes, Jose Roberto ^[2] ; Teixeira, Antonio Carlos S. C. ^[4]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING; v. 54, n. 11 JULY 2019.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 13/09543-7 - Resíduos de medicamentos veterinários no ambiente
• Beneficiário: Susanne Rath
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/07817-2 - Degradação de sulfonamidas e tetraciclinas por UV/H2O2 e O3: avaliação da atividade antimicrobiana e da toxicidade
• Beneficiário: Milena Guedes Maniero Ferreira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/50218-2 - CEPEMA - Centro Cooperativo em Engenharia Ambiental
• Beneficiário: Claudio Augusto Oller do Nascimento
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/04656-8 - Degradação de fármacos por peroxidação assistida por radiação ultravioleta e ozonização: atividade antimicrobiana e toxicidade
• Beneficiário: José Roberto Guimarães
• Modalidade de apoio: Auxílio à Pesquisa - Regular