METALLOGRAPHICAL CONSIDERATION ON THE MECHANISM OF MATRIX MODIFIER IN GRAPHITE-FURNACE ATOMIC-ABSORPTION SPECTROMETRY

In order to select the matrix modifier for graphite furnace atomic absorption spectrometry, the reactions of the analyte elements with modifiers at high temperature of ashing and atomization were studied. For Se, As, Te, Cd and so forth, which have low vapor pressure and higher excitation energy, Ni, Pd or Pt modifier can be effectively applied under optimum ashing and atomization conditions. Then phase diagrams of those elements with these modifiers can be applied to consider the process of ashing and atomization.