IMPROVED ALGORITHM FOR LINEARIZATION OF CALIBRATION CURVES IN ZEEMAN GRAPHITE-FURNACE ATOMIC-ABSORPTION SPECTROMETRY

A two-parameter model for simulation of concentration curves in Zeeman graphite furnace atomic absorption spectrometry is proposed. The algo rithm based on this model can be used for linearization of calibration curves up to the rollover point. The merits of the algorithm are supp orted by experimental data obtained for 20 elements under different me asurement conditions (light source current and slit width), including the cases where the curvature of the initial calibration curves origin ates partially from mass-dependent chemical effects and/or non-uniform atom distribution over the furnace cross section. The linearization e rror does not exceed the random scatter for replicates.