Advantages and disadvantages of this method are similar to the perforator system:
Long extraction times (48–96 h), suitability only for thermostable compounds versus
automatization and relatively high reproducibility. Noteworthy, for fossil matter the
thermal stress do not need to be considered since fossil material is intrinsically
thermostable.
A by far faster technique has been developed in the 1990s, the accelerated solvent
extraction ASE. The sample material is extracted under high pressure and with
Ref lux cooler
Extract ion
sleeve
Siphon tube
Ascending
pipe
Round f lask
with solvent
Sample
Fig. 3.9 Scheme of a Soxhlet device for the continuous extraction of solid pulverized samples
26
3 Sample Treatment