Focused microwave-assisted acid digestion of oils: an evaluation of the residual carbon content

A focused-microwave oven was applied for acid digestion of oil samples. The aim was to evaluate the efficiency of the decomposition performed on a system with six reaction vessels, one magnetron, one waveguide and six slots to control the transfer of the microwave radiation to each one of the six ca...

Full description

Saved in:
Bibliographic Details
Published in:Spectrochimica acta. Part B: Atomic spectroscopy 2001-10, Vol.56 (10), p.1981-1985
Main Authors: Costa, L.M., Silva, F.V., Gouveia, S.T., Nogueira, A.R.A., Nóbrega, J.A.
Format: Article
Language:English
Subjects:
Acid digestion
Focused microwave
ICP-OES
Oil analysis
Residual carbon content
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A focused-microwave oven was applied for acid digestion of oil samples. The aim was to evaluate the efficiency of the decomposition performed on a system with six reaction vessels, one magnetron, one waveguide and six slots to control the transfer of the microwave radiation to each one of the six cavities. The digestion efficiency was correlated with the residual carbon content, which was determined by inductively coupled plasma optical emission spectrometry with an axial view configuration. It was demonstrated that the effective power can vary up to 42% employing water for calibration. This variation in the effective power is similar to the variation observed in the residual carbon content of digested oil samples that was found to be between 2.37 and 9.71%, depending if all cavities were used simultaneously or each one individually. These aspects should be taken into account in the evaluation of possible effects on sample introduction and atomization/excitation conditions in inductively coupled plasmas
ISSN:0584-8547
1873-3565
DOI:10.1016/S0584-8547(01)00308-1