Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 31, Issue 11, Pages 2227-2232Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ja00209a
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In this work, different strategies for the analysis of selenium in human serum were validated by tandem ICP-MS and isotope dilution. The potential of flow injection-ICP-tandem MS was explored to provide accurate quantification of selenium in serum samples, thus allowing high throughputs and low sample consumption (as low as 10 mu L) without the requirement of sample preparation. The approach combining on-line isotope dilution and the use of gas modes (either oxygen or hydrogen) is ideally suited to clinical analysis. As a key prerequisite, the Se-77-enriched spike was added on-line to avoid precipitation effects that would occur if samples rich in proteins are mixed with isotopically enriched standards without undergoing previous mineralization procedures. This method proved to be fit for purpose as being validated by using a Serum-Clinchek-certified reference material and by comparing isotope dilution analysis as performed on mineralized samples.
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