Abstract
In this study, a recently sample preparation method based on focused microwave-induced combustion (FMIC) is proposed for milk powder digestion (for adult and infant nutrition) for subsequent determination of Ba, Ca, Co, Cr, Cu, Fe, Mg, Mn, Sr, V and Zn by inductively coupled plasma optical emission spectrometry (ICP OES). Combustion was carried out under oxygen flow rate (2 to 15lmin−1) using ammonium nitrate (50μl of 6moll−1 solution) as ignition aid. Samples were pressed as pellets (up to 3g) and placed on a quartz holder positioned inside the glass vessel. The concentration of the absorbing solution was investigated using nitric acid in the range of 2 to 14moll−1. Sample digestion was also performed by microwave-assisted wet digestion (MAWD) and by microwave-induced combustion (MIC). Agreement higher than 95% was obtained for all analytes by comparison with certified reference materials of milk powder after FMIC using diluted nitric acid (2moll−1) and by comparison of the results obtained by MAWD and MIC. The main advantage of FMIC when compared to MAWD and MIC is the possibility to digest higher sample masses (up to 3g) achieving better limits of detection. It was possible to use diluted nitric acid solution for analytes absorption and digests were suitable for determination of metals by ICP OES avoiding the use of more expensive instrumentation as inductively coupled plasma mass spectrometry.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
