Data/hora: 06/06/2024 05:29:13

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 25/04/2003
Data da última atualização: | 25/04/2003
Autoria: | AZEREDO, R. B. V.; COLNAGO, L. A.; SOUZA, A. A.; ENGELSBERG, M.
Afiliação: | USP-Instituto de Química de São Carlos, São Carlos, SP.; Embrapa Instrumentação Agropecuária, São Carlos, SP.; UFPE-Departamento de Física, Recife, PE.
Título: | Continuous wave free precession practical analytical tool for low-resolution nuclear magnetic resonance measurements.
Ano de publicação: | 0
Fonte/Imprenta: | Analytica Chimica Acta, Amsterdam, v. 478, p. 313-320, 2003. Também disponível em: www.sciencedirect.com
Idioma: | Inglês
Conteúdo: | The use of continuous wave free precession (CWFP) as a practical analytical tool for quantitative determinations in low-resolution nuclear magnetic resonance (LRNMR) is examined. The requirements of this technique are shown to be no more demanding than those prevailing in free-induction decay or spin-echo measurements. I is shown that the substantial gain in signal to noise ratio for a given acquisition time permitted by CWFP, can be exploited with advantage inpractically any application of LRNMR. This applies not only to homogeneous low viscosity liquid samples but also to multi-component systems where differences in relaxation times of each component permit a separation of the individual contributions. As an example, the use of CWFP for fast quantitative determination of oil and moisture in various seeds in presented.
Palavras-Chave: | CWFP; Moisture analysis; NMR; Oil analysis; Ressonância magnetica nuclear; SSFP.
Thesagro: | Análise; Óleo.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (7442-1) - UPC - SP - -- - PROCI-03.00001 -  - 2003.00001 - DIS