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An a.c. scanning method with increased sensitivity in atomic absorption analysis using a continuum primary source

W. Snelleman

Physics Laboratory, University of Utrecht, The Netherlands

Received 17 August 1967. Available online 17 January 2002.




Abstract
An expression for detection limits in atomic absorption spectrometry, using a continuum primary source, is deduced from fluctuation principles. An experimental set-up which employs a high-pressure xenon lamp and a.c. scanning of a spectral line is described, which greatly reduces the effect of instabilities in the primary source. The measurements with this set-up on Cu (3247 Å) are in agreement with the calculations. An absorption of 0.03 % is measured, equivalent to a concentration of 4 × 109 atoms per cm3 in the flame.