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Digestão de óleo lubrificante encapsulado em forno de microondas com radiação focalizada por adição de amostra ao reagente pré-aquecido

2006; Brazilian Chemical Society; Volume: 29; Issue: 6 Linguagem: Inglês

10.1590/s0100-40422006000600012

ISSN

1678-7064

Autores

Flávia A. Bressani, Hamilton O. Silva, Joaquim A. Nóbrega, Letícia M. Costa, Ana Rita A. Nogueira,

Tópico(s)

Environmental Chemistry and Analysis

Resumo

GRADUAL SAMPLE ADDITION TO PRE-HEATED ACID.The applicability of the recently proposed procedure based on gradual sample addition to microwave-assisted pre-heated concentrated acid is limited by the sample viscosity.In this work, lubricating oil samples with high viscosity were encapsulated and manually added to the microwave-assisted pre-heated concentrated digestion mixture.The procedure was applied for determination of Al, Ca, Cr, Cu, Fe, Mg, Ni, P, Pb, Si, Sn, Sr, V, W, and Zn in lubricating oil by inductively coupled plasma optical emission spectrometry (ICP OES).Determined and certified values for Ca, Mg, P, and Zn in lubricating oil were in agreement at a 95% confidence level.

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