due to its high sensitivity
and selectivity and relatively low instrumental cost. This method,
however, involves a previous digestion of the sample and the
introduction of acid solutions for the generation of Hg vapour.
Because of this, the direct volatilization of Hg through sample
ashed in an oxygen
flow followed by the pre-concentration of Hg in
a gold trap could provide a direct high sensitive alternative for Hg
determination of trace levels in complex samples, thus avoiding
problems found in multistep methods [26].