NDLI: Determination of lead at low concentrations in food samples by electrothermal atomic absorption spectrometry

Content Provider	Royal Society of Chemistry (RSC)
Author	Kumpulainen, J. Tahvonen, R.
Copyright Year	1994
Abstract	A method for the determination of Pb in biological materials by electrothermal atomic absorption spectrometry was tested at a wavelength of 217.0 nm and with 0.1% Pd as the chemical modifier. A Varian SpectrAA 400 Zeeman spectrometer equipped with a Photron Pb Superlamp was employed. As the contents of Pb in most biological materials are near the limit of detection, peak height measurement and the method of standard additions were used. The validity of the method was tested using the following ARC/CL-coded reference materials: wheat flour, potato powder, milk powder and animal muscle, in addition to various other commercial reference materials. Recovery tests were made on some reference materials. The accuracy of the method was satisfactory for the tested materials. High lamp intensity and the most sensitive Pb wavelength resulted in better characteristic masses; the characteristic mass in peak height mode at 283.3 nm with a hollow cathode lamp was usually 5–8 pg and at 217.0 nm with the Superlamp, 3–5 pg, depending on the sample matrix. Low backgrounds were measured in the sample materials. Ammonium phosphate cannot be employed as the chemical modifier when using the 217 nm line, as phosphate species cause spectral interferences at that wavelength.
Starting Page	1427
Ending Page	1432
Page Count	6
File Format	PDF
ISSN	02679477
Volume Number	9
Issue Number	12
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9940901427
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Zeeman Lead Absorption spectroscopy Wavelength Varian Associates Spectrometer Photron Potato Cathode Matrix (chemical analysis) Ammonium phosphate Phosphate
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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