LINEARIZATION OF CALIBRATION CURVES IN ZEEMAN ATOMIC-ABSORPTION SPECTROMETRY

The theoretical models for calibration curves proposed earlier (Spectrochimica Acta 47B, 889 (1992)), based on taking into account the non-absorbed fraction of the light source radiation in the Bouguer-Lambert-Beer law, are compared with experiment. Of the three versions considered the most accurate and broadly applicable is the mode involving only one parameter, the roll-over absorbance, A(r). Its validity for the Zeeman calibration curves has been confirmed for seven elements in flame and 14 elements in graphite furnace atomic absorption spectrometry (GFAAS). The computer program based on this model provides linearization of calibration curves in GFAAS over the range extending from the characteristic masses, m0, up to analyte masses exceeding the m0-values by two or three orders of magnitude.