Sulfadiazine dissipation in acidic tropical soils

Autor(es)

Reia, Marina Yasbek ^[1] ; Leal, Rafael Marques Pereira ^[2] ; Tornisielo, Valdemar Luiz ^[3] ; Viana, Douglas Gomes ^[1] ; Regitano, Jussara Borges ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, ESALQ, Coll Agr Luiz de Queiroz, Dept Soil Sci, POB 9, BR-13418900 Piracicaba, SP - Brazil

^[2] Goias Fed Inst Sci Technol & Educ, POB 66, Campus Rio Verde, BR-75901970 Rio Verde, Go - Brazil

^[3] Univ Sao Paulo, CENA, Ctr Nucl Energy Agr, Ecotoxicol Lab, POB 96, BR-13400970 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 27, n. 17 APR 2020.
• Citações Web of Science: 0

Resumo

Sulfadiazine (SDZ) residues have been detected in manured soils as well as their adjacent water resources, but its behavior is still poorly understood in acidic tropical soils. This research aimed to evaluate sorption, leaching, and biodegradation of C-14-SDZ in four acidic soils from Brazil, using OECD guidelines. Except for the sand soil (K-d = 2.6 L kg(-1)), SDZ sorption tended to be higher (K-d > 8.4 L kg(-1)) and more hysteretic (Delta H >> 1) in acidic soils. When freshly applied, SDZ leaching was low (< 0.11% of applied radioactivity (AR)) and could not always be predicted by K-d values; but leaching was restricted when SDZ was aged for 62 days. SDZ mineralization was low (< 3%) but its dissipation was fast (DT50 < 2.3 days and DT90 < 6.3 days) due to fast initial degradation (an unknown metabolite was immediately formed, likely 4-hydroxysulfadiazine) and mainly to fast formation of non-extractable residues (NER) (> 78% of AR up to 7 days). For certain acidic soils, the abrupt breakdown of the SDZ suggests that degradation should be initially chemical and then followed by enzymatically driven reactions. The fast formation of NERs was attributed mostly to chemical bounding to soil humic substances (Type II-NER), but SDZ sequestration cannot be ruled out (Type I-NER). NERs represent a long-term environmental reservoir of SDZ that may cause deleterious effects on non-target organisms as well as promote antibiotic resistance to soil microbes. (AU)

• Processo FAPESP: 09/01596-9 - Monitoramento ambiental de resíduos de antibióticos usados na avicultura brasileira
• Beneficiário: Jussara Borges Regitano
• Modalidade de apoio: Auxílio à Pesquisa - Regular