Data/hora: 12/06/2024 14:55:34

Biblioteca(s): 	Embrapa Arroz e Feijão; Embrapa Solos.	
Data corrente: 	27/02/2013	
Data da última atualização: 	10/06/2024	
Autoria: 	NOVOTNY, E. H.; AUCCAISE, R.; LIMA, L. B.; MADARI, B. E.	
Afiliação: 	ETELVINO HENRIQUE NOVOTNY, CNPS; RUBEN AUCCAISE; L. B. LIMA, UNIVERSIDADE FEDERAL DE GOIÁS; BEATA EMOKE MADARI, CNPAF.	
Título: 	Characterisation of humic substances extracted from soil treated with charcoal (Biochar).	
Ano de publicação: 	2013	
Fonte/Imprenta: 	In: XU, J.; WU, J.; HE, Y. (ed.). Functions of natural organic matter in changing environment. Dordrecht: Springer, 2013. p. 971-974.	
DOI: 	https://doi.org/10.1007/978-94-007-5634-2_178	
Idioma: 	Inglês	
Conteúdo: 	The high fertility and resilience of Terras Pretas de Índios are attributed to the high contents of polycondensed aromatic structures with carboxylic functionality originating from the natural alterations of carbonised biomass added to the soil by the pre-Columbian indigenous populations. There are several proposals to reproduce the positive characteristics of these special soils, including the use of charred biomass (biochar); however, the time necessary to modify this material in the peculiar organic matter of Terras Pretas de Índios is still undetermined. The 13 C NMR analysis of the humic acids extracted at pH 10.6 from soils treated with fines of charcoal indicates that after 3 years a small portion of the added charcoal is already partially oxidised to a compound similar to the ones found in Terras Pretas de Índios; however, the large fraction still looks like unaltered charcoal. Additionally, the proposed method of selective extraction of the characteristic humic fraction from Terras Pretas de Índios, combined with multivariate data analysis tools, can be used as a method to evaluate the proposals to reproduce these special soils.	
Palavras-Chave: 	Chemometry; NMR; Pyrogenic carbon.	
Thesaurus Nal: 	biochar; humic acids; humin.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (17269-1) - UPC - AA - DD -  -  - 2013.00130 - DIS
CNPAF - (36790-1) - UPC - AA - DD - 2013 -  - 2013 - DIS