NDLI: Application of palladium as a chemical modifier in electrothermal atomic absorption spectrometry with a tungsten tube atomizer

Content Provider	Royal Society of Chemistry (RSC)
Author	Xiao-quan, Shan Sychra, Vaclav Radziuk, Bernard Welz, Bernhard
Copyright Year	1992
Abstract	The characteristic mass, expressed as integrated absorbance, determined for a number of volatile elements in a tungsten tube atomizer (WETA) is higher by a factor of 3–10 compared with a graphite furnace (GF). The use of palladium as a chemical modifier increases the sensitivity for most of the elements of interest, except for silver, by 20–200% in the WETA. This effect has not been encountered in the GF. The temperatures to which the elements could be stabilized by palladium are comparable to those in the GF and are typically between 850 and 1300 °C. Up to 15% hydrogen in the argon purge gas had no influence on the sensitivity but increased the lifetime of the tungsten tubes. Higher concentrations of hydrogen in the purge gas resulted in a decrease in sensitivity for most of the elements investigated. Interference of HClO4 in the WETA was found to be less pronounced than has been reported for the GF. Most of the interferences due to sodium chloride, calcium chloride, hydrochloric acid and perchloric acid are significantly reduced by the addition of palladium as a chemical modifier.
Starting Page	389
Ending Page	396
Page Count	8
File Format	PDF
ISSN	02679477
Volume Number	7
Issue Number	2
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9920700389
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	WETA Tungsten WETA-TV Graphite Hydrogen Argon Sodium chloride Calcium chloride Acid
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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