Microwave-assisted sample combustion: a technique for sample preparation in trace element determination

Analytical Chemistry
Erico Marlon de Moraes FloresG Knapp

Abstract

A novel digestion procedure based on sample combustion ignited by microwave radiation is proposed for organic samples. Certified samples of bovine liver, pig kidney, and skim milk were used as examples to demonstrate the performance of the proposed procedure. Cadmium and copper were determined in these samples by electrothermal atomic absorption spectrometry. Samples (between 50 and 250 mg) were wrapped with paper and placed on a homemade quartz holder that was positioned inside to quartz vessels used in a commercial microwave oven. Ammonium nitrate solution was added to the paper, and vessels were pressurized with oxygen to 15 bar. The rotor containing four vessels was placed inside the oven, and microwave radiation was applied for 20 s at 1400 W. Combustion was complete in few seconds, and an additional reflux step, which was optional, was applied. The agreement to the certified values was between 96 and 105% for both analytes. Only with the combustion step, the residual carbon (RC) was below 1.3%. The RC decreased to less than 0.4% when an additional reflux step with concentrated nitric acid was applied.

References

Feb 24, 2001·Analytical Chemistry·R C RichterH M Kingston

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Citations

Feb 6, 2010·Analytical and Bioanalytical Chemistry·Diogo P MoraesErico M M Flores
May 14, 2010·Analytical and Bioanalytical Chemistry·Márcia F MeskoErico M M Flores
May 14, 2008·Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment·Elane S Boa MorteMaria das Gracas A Korn
Apr 16, 2013·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Jennifer A Berger Ritchie, Shawn L Gerstenberger
Mar 5, 2020·Rapid Communications in Mass Spectrometry : RCM·Marcia Foster MeskoPriscila Tessmer Scaglioni
Jan 18, 2020·Rapid Communications in Mass Spectrometry : RCM·Erico M M FloresRochele S Picoloto
May 13, 2020·Analytical and Bioanalytical Chemistry·Marcia F MeskoVanize C da Costa
Feb 11, 2010·Analytical Chemistry·Márcia F MeskoErico M M Flores
Nov 23, 2012·Analytical Chemistry·Erico M M FloresRalph E Sturgeon
May 20, 2020·Analytical Chemistry·Fabio Andrei DuarteJuliano Smanioto Barin

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