NDLI: Accurate determination of selenium in the presence of iron by deuterium arc electrothermal atomic absorption spectrometry

Content Provider	Royal Society of Chemistry (RSC)
Author	Kumar, Sunil Jai Gangadharan, S.
Copyright Year	1993
Abstract	A method is described which eliminates the over-correction due to spectral interference of iron on the total absorbance of selenium. A pyrolytic graphite platform was pre-treated with 1 mg ml–1 of platinum and 5% m/v ascorbic acid solution. A 2 µl volume of a 1 mg ml–1 palladium solution in 4% nitric acid and 0.5% m/v ascorbic acid was used to stabilize and enhance selenium sensitivity. A novel way of simultaneous introduction of palladium and ascorbic acid solutions, without the precipitation of palladium is discussed. Palladium is found to delay atomization of selenium to temperatures of up to 1500 °C. Studies were carried out on 0.6 ng of selenium with varying amounts of iron in the furnace. For an absolute iron content of 40 µg in the furnace, a recovery of 101% was obtained. The method was tested on a solution containing 50 ng ml–1 of selenium in the presence of 2.5 mg ml–1 of iron. The standard additions method was used to analyse the solution. A characteristic mass of 25 pg was obtained.
Starting Page	127
Ending Page	129
Page Count	3
File Format	PDF
ISSN	02679477
Volume Number	8
Issue Number	1
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9930800127
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Selenium Pyrolysis Graphite Acid
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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Accurate determination of selenium in the presence of iron by deuterium arc electrothermal atomic absorption spectrometry