High-frequency electrodeless discharge lamps for atomic absorption analysis

In this paper we present the results of an investigation of high-frequency electrodeless discharge lamps (HFEDLs), containing Cd, Zn, Hg, As, Te, Se, Pb, Sn, Tl and Bi, developed in our laboratories as light sources for atomic absorption spectrometry (AAS). Important physical processes in the lamps are discussed. Essential characteristics of HFEDLs for AAS, such as intensity, stability and operating life are considered. The intensities and detection limits are compared with the corresponding characteristics of hollow cathode lamps. The temporal behavior of an As HFEDL is compared with that of a commercially available electrodeless discharge lamp. Detection limits in graphite furnace AAS with HFEDLs were better by a factor of 1.5–8 depending on the element. Spectral line widths are reported for isotope HFEDLs. An increase in AAS sensitivity by factors of 1.5–3.2 is found with the use of HFEDLs with enriched isotopes.