Direct determination of chromium in gelatine by graphite furnace atomic absorption spectrophotometry

A fast and direct method for the determination of Cr in gelatine using graphite furnace atomic absorption spectrophotometry with Zeeman-effect background correction is described. No sample pre-treatment was necessary, minimizing the risk of contamination. The concentration of chromium in gelatine wa...

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Bibliographic Details
Published in:Food chemistry 1999-02, Vol.64 (3), p.429-433
Main Authors: QUINAIA, S. P, NOBREGA, J. A
Format: Article
Language:English
Subjects:
Biological and medical sciences
Chromium
Electrothermal atomization
Food industries
Food toxicology
Fundamental and applied biological sciences. Psychology
Gelatine
Graphite furnace
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Summary:A fast and direct method for the determination of Cr in gelatine using graphite furnace atomic absorption spectrophotometry with Zeeman-effect background correction is described. No sample pre-treatment was necessary, minimizing the risk of contamination. The concentration of chromium in gelatine was directly evaluated applying the standard additions method from a metal spiked gelatine (0.5% m/v) dispersed in 1% v/v nitric acid solution. The heating program was implemented in 68 s. The estimated mean characteristic mass is 3.4 pg Cr for a 15 μl sample. The Cr values determined in gelatine with the proposed procedure are in close agreement with those obtained by employing an acid digestion procedure ( r = 0.9987).
ISSN:0308-8146
1873-7072
DOI:10.1016/S0308-8146(98)00114-9