University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Vegetable -> artichoke

Citations 1

"Atomic Absorption Spectrometric Analysis Of Solids With Online Microwave-assisted Digestion"
J. Anal. At. Spectrom. 1992 Volume 7, Issue 7 Pages 1085-1089
V. Carbonell, A. Morales-Rubio, A. Salvador, M. de la Guardia, J. L. Burguera and M. Burguera

Abstract: A description is given of a procedure for online microwave-assisted digestion of solid samples prior to analysis by flame AAS as described previously (Anal. Chim. Acta, 1990, 238, 417). A slurry of the sample is transported in HNO3 - H2O2 (1:1) to extract Cu and Mn quantitatively in a few min. Digestion times vary from 4 min for sewage sludges to 2 min for matrices like artichoke. Detection wavelengths were 324.7 nm for Cu and 279.5 nm for Mn. A closed flow injection system allows digestion to be conducted online. Sample flow rate was 2.8 mL min-1. Over 15 samples h-1 can be analyzed using the procedure which allows for sequential treatment of different samples. A procedure was developed for the online microwave-assisted digestion of solid samples and their anal. by flame atomic absorption spectrometry. The method involves the transport of a slurry of the sample in a 1+1 mixture of concentrated HNO3 and H2O2, which provides quant. extraction of Cu and Mn in a few minutes. Real samples of sewage sludges dispersed in 20 mL of HNO3 and H2O2 can be digested in 4 min and other matrixes, such as artichoke and diet samples dispersed in 10 mL of HNO3 and H2O2 are digested in only 2 min. A closed flow injection system permits the online digestion to be carried out; the use of two interconnected injection valves allows the measurement of standards during the digestion of samples. The method permits the anal. of more than 15 samples per h and provides accurate results, as demonstrated by the anal. of certified samples of sewage sludges and tomato leaves.
Copper Manganese Sample preparation Spectrophotometry Microwave Online digestion Slurry Reference material