On-line digestion in a focused microwave-assisted oven for elements determination in orange juice by inductively coupled plasma optical emission spectrometry

Autor(es)

Sabrina P. Fili ^[1] ; Elisabeth Oliveira ^[2] ; Pedro V. Oliveira ^[3]

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo. Instituto de Química - Brasil

^[2] Universidade de São Paulo. Instituto de Química - Brasil

^[3] Universidade de São Paulo. Instituto de Química - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 14, n. 3, p. 435-441, 2003-05-00.

Resumo

A flow injection system coupled to focused microwave-assisted oven was used for on-line orange juice sample digestion for determination of Ca, Cu, Fe, K, Mg, Mn, Na, P, and Zn by inductively coupled plasma optical emission spectrometry. The reactor coil was a PTFE tube (4.0 m long and 1.6 mm i.d.) positioned into the commercial glass tube of the focused microwave oven. Aliquots of 500 muL of sample and 1000 muL of reagent (80% v/v HNO3) were mixed in a confluence and carried out to the reactor coil by air carrier. The relative standard deviation for five replicates of sample was lower than 5.0%. Good recoveries varying from 91 to 111% were obtained for added concentrations of the interest elements. The results obtained using the proposed digestion system are in agreement with those obtained for total digestion at the 95% confidence level. With this on-line digestion system was possible to carry out 12 samples h-1, minimizing contamination, saving consumption of samples and reagent and low residue generation. (AU)

• Processo FAPESP: 01/07048-1 - Espectrometria de absorcao atomica: desenvolvimento de metodos analiticos para a determinacao de elementos de interesse em amostras biologicas.
• Beneficiário: Pedro Vitoriano de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 00/06796-1 - Espectrometria de absorção atômica com atomização eletrotérmica ou chama: desenvolvimento de metodologias analíticas para aplicações em amostras biológicas, ambientais, de alimentos e de produtos industriais
• Beneficiário: Elisabeth de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular