NDLI: Determination of selenium by electrothermal atomic absorption spectrometry. Part 1. Chemical modifiers

Content Provider	Royal Society of Chemistry (RSC)
Author	Dočekalová, Hana Novotný, Ivan Dočekal, Bohumil Komárek, Josef
Copyright Year	1991
Abstract	The effect of various chemical modifiers, including nitrates of palladium, nickel, magnesium, calcium, lanthanum, europium and aluminium, on the analytical signal of selenium in a graphite furnace was studied. The signals of various selenium compounds, such as selenite, selenate and organic compounds representing different types of selenium forms in body fluids (selenomethionine and trimethylselenium iodide), were evaluated. The shape of the transient signal appears to be influenced not only by the chemical reactions in the graphite–selenium–modifier system, but also very strongly by vaporization effects connected with the physical character of the charred residue. It follows that successful chemical modification involves the application of a considerable excess (higher than 1000-fold) of some metal nitrates, which produce refractory oxides and no thermally stable carbides, and are at the same time capable of quantitative conversion of the analyte into a single form. An integral part of the modifier action is trapping of the resulting compound by the modifier residue.
Starting Page	661
Ending Page	668
Page Count	8
File Format	PDF
ISSN	02679477
Volume Number	6
Issue Number	8
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9910600661
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Nickel Magnesium Calcium Lanthanum Europium Aluminium Selenium Graphite Selenate Selenomethionine Iodide Analyte Integral
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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