Facultade de Fisioterapia

Effect of matrix components on chromium atomization processes in graphite furnace-atomic absorption spectrometry

Authors: JR Castillo, JM Mir, Carlos Bendicho

Journal: Spectrochimica Acta Part B, 43: 263-271, 03/1988

DOI: https://doi.org/10.1016/0584-8547(88)80052-1


Abstract

The effect of various organic and inorganic matrix components on chromium atomization in graphite furnace atomic absorption spectrometry is studied. The results are explained on the basis of chromium's atomization mechanisms. The two predominant mechanisms are the thermal dissociation of the oxide and of the carbide. Losses through molecular volatilization reduce the sensitivity when chromium chelate complexes are atomized. In this case, the atomization mechanism consists of the thermal dissociation of the chelate. The formation of chromium carbide from the carbon residue produced by decomposition of the organic solvents leads to a loss of sensitivity.