Data/hora: 22/09/2024 09:40:11

Biblioteca(s): 	Embrapa Instrumentação.	
Data corrente: 	11/08/2004	
Data da última atualização: 	08/03/2010	
Autoria: 	NOVOTNY, E. H.; MARTIN-NETO, L.	
Título: 	Spectroscopic studies of soil humic acids from tillage systems experiments - multivariate data analyzes	
Ano de publicação: 	2004	
Fonte/Imprenta: 	In: INTERNATIONAL MEETING OF INTERNATIONAL HUMIC SUBSTANCES SOCIETY. -- IHSS, 12, São Pedro, SP, 2004. Humic substances and soil and water environment. Abstracts...[São Carlos], SP: Embrapa Instrumentação Agropecuária, 2004. p. 46	
Idioma: 	Inglês	
Conteúdo: 	I. INTRODUCTION 
For the characterization 01 humic substances, several chemical and physical methods hav been used intensely. Among these, spectroscopic methods such as nuclear magnetic resonan (NMA), electron paramagnetic resonance (EPA) and Iluorescence have received special attenti Nevertheless, the presence of residual paramagnetic ions in humic substances can affect t spectroscopic results. 80, the direct interpretation of  these results and correlations between lhe", and intrinsic characteristics 01 lhe samples, such as humilication degree, can be mistaken. The challenge is to isolate the effect 01 the paramagnetic ions in such a way that the obtained spectrosc ' data can be used to inler about the structure 01 the humic substances. A technique that cal) uselul lor that is the multivariate statistics, especially the Principal Components Analysis (PCA).

Palavras-Chave: 	Ácido húmico; RMN; Soil humic acids; Solo húmico.	
Thesaurus Nal: 	spectroscopy; tillage.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (8323-1) - UMT - SP - -- - PROCI-04.00003 -  - 2004.00003 - DIS
CNPDIA - (8564-1) - UMT - SP - -- - PROCI-04.00061 -  - 2004.00061 - DIS