As expected, higher concentrations of metals that
showed measurable concentrations were obtained with the
method of digestion in an autoclave. It is clear that during
this procedure with a small amount of the mixture for the
digestion with the increased pressure the plant is com-
pletely digested, because it gives much higher temperature
than using the wet digestion at normal pressure. The
sample is totally digested using dry ashing and the con-
centrations obtained with this method are higher than these
obtained by wet ashing at normal pressure. Lower con-
centrations obtained using dry ashing compared to those
obtained after digestion in an autoclave can be attributed to
losses produced primarily because of heating at high tem-
peratures but in open system (vessels). Some metals can be
lost by evaporation, and some withdrawn with gasses
occurred after combustion of organic matter. Also, part of
metals may remain on the walls of the crucible for ashing
or otherwise lost during the transfer of ashes.