NDLI: Omission of the ashing stage in the determination of aluminium and lead in waters by graphite furnace atomic absorption spectrometry

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Journal of Analytical Atomic Spectrometry Vol - 4 Issue - 1

Journal of Analytical Atomic Spectrometry Vol -2

Omission of the ashing stage in the determination of aluminium and lead in waters by graphite furnace atomic absorption spectrometry

Content Provider	Royal Society of Chemistry (RSC)
Author	Halls, David J.
Copyright Year	1989
Abstract	Omission of the ashing stage in the determination of aluminium and lead in waters by graphite furnace atomic absorption spectrometry on uncoated tubes initially led to lower sensitivity and poor accuracy. Sensitivity could be restored by increasing the drying time to about 40 s or by increasing the drying temperature. The original effect is thought to be due to interference from water vapour; the time was insufficient to remove water vapour before atomisation occurred. Higher drying temperatures (180–260 °C), leading to rapid expulsion of the water vapour, gave results with no loss in precision. A temperature of 250 °C held for 12 s was chosen for drying. With these revised programmes having no ashing stage, satisfactory recovery was demonstrated for aluminium (98 ± 6%, n= 10) and lead (101 ± 2%, n= 8) in domestic water samples. Cycle times were 54 and 55 s for aluminium and lead, respectively. The method for lead involved the use of a mixture of lanthanum and nitric acid as a modifier, but omission of the ashing stage did not affect the accuracy. In a separate experiment, it was shown that the suppression of sulphate interference by the lanthanum modifier was the same with and without an ashing stage.
Starting Page	149
Ending Page	152
Page Count	4
File Format	PDF
ISSN	02679477
Volume Number	4
Issue Number	2
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9890400149
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Aluminium Graphite furnace atomic absorption Lanthanum Acid
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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