Crucible Atomizers Open Up New Opportunities for the Atomic Absorption Analysis of Trace Elements in Solid Samples with the Use of Fractional Evaporation

Resumo

The atomic absorption analysis of trace elements in natural solid samples with the use of an improved crucible atomizer with several condensation/evaporation zones is shown to be advantageous. A new approach to fractional preconcentration is proposed, including two stages of thermal decomposition (high-temperature and low-temperature) of solid sample components when elements are evaporated and their vapors are condensed in heated and unheated zones. This approach facilitates the efficient suppression of non-selective interferences and matrix effects. It also improves the metrological characteristics of the element analysis of samples of complex composition.