Data/hora: 21/06/2024 05:35:36

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 22/12/1999
Data da última atualização: | 22/12/1999
Autoria: | SPOSITO, G.; MARTIN-NETO, L.; YANG, A.
Afiliação: | University of California, Berkeley; EMBRAPA-CNPDIA.
Título: | Mechanisms of atrazine reactions with humic acid.
Ano de publicação: | 1996
Fonte/Imprenta: | In: AMERICAN GEOPHYSICAL UNION MEETING, Dec. 1996, San Francisco, CA, Estados Unidos. Abstracts... San Francisco: American Geophysical Union, 1996.
Páginas: | não paginado.
Idioma: | Inglês
Conteúdo: | Among the post-emergent herbicides, atrazine (6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine) is the one most applied worldwide. It is also widely detected in water supplies, thus an important indicator of pesticide contamination, with growing public concern over its potential carcinogenic effects. The complexation pathways of atrazine with humic acid remain controversial, in part because of the absence of direct spectroscopic information. The basic question is whether proton-transfer and, to a lesser extent, hydrogen bonding are as important as electron-transfer in the mechanisms of reaction between atrazine and humic acid. Representative tropical and temperate-zone humic acids were reacted at pH<7 with 140 mmol mE-3 atrazine solution under exclusion of light. Infrared and electron spin resonance spectra of the resulting products gave evidence for proton-transfer and, under certain conditions, electron-transfer reactions. These spectroscopic data and those from other published studies were analyzed in terms of the molecular properties of humic acids and s-triazines, out of which emerged a guiding principle to characterize the complexation mechanisms of s-triazines with humic acid: proton-transfer is favored (and electron-transfer is disfavored) for humic acids of high acidic functional group content and for s-triazines of low basicity. Electron-transfer mechanisms are favored for humic acids of low acidic functional group content and for s-triazines of high basicity...
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (5597-1) - UPC - SP - -- - PROCI-96.00181 -  - 1996.00181 - DIS