Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1189065 | Food Chemistry | 2008 | 6 Pages |
Abstract
A relatively cheap and accessible way to analyze difficult samples without loss of analyte was optimized for determination of Cd, Cr, Cu, Hg, Ni, Pb, V and Zn in animal material. Reference materials with suitable matrix were used: Dorm-2 (Dogfish Muscle), Tort-2 (Lobster Hepatopancreas), and SRM 2976 (Mussel Tissue). The analytical procedure included digestion of the sample in Parr reactor bombs combined with a commercial microwave oven and metals analysis by atomic absorption spectrometry. A weak digestion procedure was optimized to prevent metal losses: a two-step digestion with an aqueous solution of HNO3, each step carried at a microwave power of 340Â W during 4Â min. With the optimized procedure, metals concentrations in all reference materials matched certified ones (for a 95% level of confidence) with the exception of Cd in Tort-2 and Hg in SRM 2976. The present work reinforces the need to use matrix-matched reference materials and that any digestion protocol needs to be modified to maximize recoveries.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Pedro A. Reis, C. Marisa R. Almeida,