NDLI: Evaluation of digestion procedures for the determination of selenium in soil comparing vapour generation and graphite furnace atomic absorption spectrometry with Zeeman-effect background correction

Content Provider	Royal Society of Chemistry (RSC)
Author	Brodie, Keith G. Nham, Tran T.
Copyright Year	1989
Abstract	In this work, three mixed acid digestion methods, HNO3-HClO4-HF, HNO3-H2O2-HF and HNO3-HCl-HF, have been studied. The digest solutions were analysed for selenium by graphite furnace atomic absorption spectrometry (GFAAS) using either deuterium or Zeeman-effect background correction systems and by vapour generation atomic absorption spectrometry (VGAAS). Because soil samples contain substantial amounts of iron and phosphorus, the accurate determination of selenium by deuterium are background corrected GFAAS is complicated by the well documented spectral interferences which give rise to over-correction. However, this over-correction can be simply eliminated by the use of Zeeman-effect background corrected GFAAS. The accuracy of the methods was assessed by the use of the NIST Standard Reference Material (SRM) Coal Fly Ash 1633A. The precision of the measurements (RSD) ranges from 3.8 to 9.9% with Zeeman-effect GFAAS, and from 0.2 to 1.5% with VGAAS, for selenium concentrations of up to 20 ng ml–1. The three digestion methods give comparable results on both Zeeman-effect GFAAS and VGAAS. However, the HNO3-H2O2-HF and HNO3-HCl-HF procedures are preferred because they are simple and less time consuming.
Starting Page	697
Ending Page	700
Page Count	4
File Format	PDF
ISSN	02679477
Volume Number	4
Issue Number	8
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9890400697
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	NIST Standard Reference Material SRM Acid Nitric acid Hydrofluoric acid Hydrogen peroxide Digest (Roman law) Selenium Graphite furnace atomic absorption Deuterium Absorption spectroscopy Phosphorus National Institute of Standards and Technology Certified reference materials
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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