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There is substantial evidence of the complexity of selenium speciation in living organisms and of the importance of the selective determination of the particular species of this element in order to understand its metabolism and biological significance in clinical chemistry, biology, toxicology, and nutrition.
The state-of-the-art of analytical techniques available for this purpose is critically evaluated with particular emphasis on the element-selective detection and identification of the detected selenium compounds. Whereas there are a number of techniques available that are able to detect various selenium species in living organisms selectively, few techniques exist that are able to identify and to characterize the species detected.

Pure Appl. Chem., Vol. 72, No. 3, pp. 447–461, 2000.
IUPAC Technical Report
© 2000 IUPAC
IUPAC permission is acknowledged

Abstract

The separation and analysis of mixtures of volatile substances can be made by means of gas chromatography (GC). The use of this technique requires some care, among them the right choice of stationary phase (SP) and mobile phase (MP). The temperature must also be controlled to ensure the reproducibility of the analyses. These and other critical points of the gas chromatographic technique will be discussed in this article.

Keywords
chromatography, gas chromatography, column chromatography, tubular columns, packed columns, stationary phase, detectors.

Author
Fábio Augusto
Universidade Estadual de Campinas, Instituto de Química

Translated by
João C. de Andrade

Revised by
Carol C. Collins