This document introduces a method for using a graphite platform in graphite furnace atomic absorption spectrometry (GFAAS) to reduce matrix interferences. This method reduces chemical interferences and spectral interferences by separating the time of sample vaporization and analysis of chemical elements. The method can be used to determine volatile elements in complex matrices.
Graphite furnace techniques offer high sensitivity for trace element analysis but are often plagued by chemical and spectral interferences, particularly with volatile elements in complex matrices. This document introduces the graphite platform technique proposed by L'vov, where sample atomization occurs from a platform rather than the tube wall. The temperature lag of the platform delays vaporization, which reduces background absorption and minimizes the formation of volatile compounds that cause interference.
The technique reduces chemical and background interferences by delaying sample vaporization, which discourages volatile compound formation and increases dissociation of molecular species.
It minimizes the build-up of refractory MgO flakes on the tube ends, allowing for long-term stability without frequent cleaning compared to wall atomization.