Data/hora: 19/06/2024 14:16:03

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 07/06/2004
Data da última atualização: | 06/05/2022
Autoria: | ARAÚJO, G. C. L.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A.
Afiliação: | GEORGIA C. L. ARAUJO, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; JOAQUIM A. NÓBREGA, UFSCAR.
Título: | Microwave single vessel acid-vapor extraction: effect of experimental paramenters on Co and Fe determination in biological samples.
Ano de publicação: | 2004
Fonte/Imprenta: | Microchimica Acta, v.144, p.81-85, 2004.
DOI: | 10.1007/s00604-003-0092-3
Idioma: | Inglês
Conteúdo: | Characteristic parameters of a single vesselprocedure were investigated for Co and Fe determina-tion in biological samples using nitric acid-vapor extrac-tion under atmospheric pressure. A laboratory-madePTFE support vessel suitable for four cups containingthe samples was adapted to fit on the microwave glassvessel. Biological samples (30 mg) were weigheddirectly into these PTFE cups and exposed to nitric acidvapor stemming from 15 mL concentrated HNO3placedin the bottom of the glass vessel. Sample cups werepositioned at 50, 80, 110, and 140 mm from the supportbase. We evaluated the temperature, acidity, and resi-dual carbon content of each sample cup, i.e. parametersthat could influence the efficiency of vapor-phase aciddigestion. The influence of sample particle size ondigestion efficiency was also considered. It was demon-strated that temperature was the main parameter forefficient recovery of both Co and Fe in biological sam-ples, and higher temperatures allowed lower residualcarbon contents.
Palavras-Chave: | Microwave; Sample preparation; Single vessel; Vapor phase.
Categoria do assunto: | W Química e Física
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (15138-1) - UPC - AP - DD - PROCI-2004.00027 - ARA - 2004.00027 - DIS