Data/hora: 16/06/2024 01:31:15

Biblioteca(s): | Embrapa Solos.
Data corrente: | 25/10/2021
Data da última atualização: | 26/10/2021
Autoria: | DE PIERRI, L.; NOVOTNY, E. H.; CERRI, C. E. P.; SOUZA, A. J. de; MATTOS, B. B.; TORNISIELO, V. L; REGITANO, J. B.
Afiliação: | LETÍCIA DE PIERRI, USP/ESALQ; ETELVINO HENRIQUE NOVOTNY, CNPS; CARLOS EDUARDO PELLEGRINO CERRI, USP/ESALQ; ADIJAILTON JOSÉ DE SOUZA, USP/ESALQ; BIANCA BRAZ MATTOS, CNPS; VALDEMAR LUIZ TORNISIELO, USP/CENA; JUSSARA BORGES REGITANO, USP/ESALQ.
Título: | Accessing biochar's porosity using a new low field NMR approach and its impacts on the retention of highly mobile herbicides.
Ano de publicação: | 2022
Fonte/Imprenta: | Chemosphere, v. 287, pt. 3, 132237, Jan. 2022.
DOI: | https://doi.org/10.1016/j.chemosphere.2021.132237
Idioma: | Inglês
Conteúdo: | Agrowaste biochars [sugarcane straw (SS), rice husk (RH), poultry manure (PM), and sawdust (SW)] were synthesized at different pyrolysis temperatures (350, 450, 550, and 650 °C) to evaluate their potential to retain highly mobile herbicides, such as hexazinone and tebuthiuron that often contaminate water resources around sugarcane plantations. A new low field nuclear magnetic resonance approach based on decay due to diffusion in internal magnetic field (NMR-DDIF) was successfully used to determine biochar's porosity and specific surface area (SSA) to clear the findings of this work. SSA of pores with diameters >5.0 um increased with pyrolysis temperatures and seemed to dictate biochar's retention, which was >70% of the applied amounts at 650 °C. These macropores appear to act as main arteries for herbicide intra-particle diffusion into smaller pores, thus enhancing herbicides retention. Biochar granulometry had little, but herbicide aging had a significant effect on sorption, mainly of tebuthiuron. However, soils amended with 10,000 kg ha-1 of the biochars showed low sorption potential. Therefore, higher than usual biochar rates or proper incorporation strategies, i.e., surface incorporation, will be needed to remediate areas contaminated with these highly mobile herbicides, thus precluding their leaching to groundwaters.
Palavras-Chave: | DDIF.
Thesaurus Nal: | Biochar; Hexazinone; Leaching; Sorption; Tebuthiuron.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (20881-1) - UPC - AP - DD -  -  -  - DIS