Buchi K-424, Руководство по эксплуатации

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10
Digestion Unit K-424 5 Operation
This apparatus is used for procedures that require the use
of heat and hazardous sulphuric acid. Wear goggles and
protective clothing and exercises extreme caution when
working in this area.
Seal off unused connecting branches with the glass cap
(item n
o
17396)
It is essential, that the gaskets are fitted correctly on the
suction tube and are leaned symmetrical on the glass!
Regulation of the heating power depends on a variety of
factors such as the quantity to be digested, the types of
reagents, etc.
To carry out the digestion in the minimum time, the samples
are digested at full power.
The digestion time depends on the material to be digested
and must be determined by experiment. (Continue boiling
for about 15 minutes after the solution has become clear.)
After the sample has cooled, the digestion tube can be
connected direct to a Büchi Distillation Unit for carrying out
the distillation.
If a digested sample takes a relatively long time to cool, it
may solidify. Before it is distilled, the sample must be
liquefied again:
- by the careful addition of a small quantity of distilled
water, or
- by gentle heating in the Digestion Unit.
Fig. 8: Gaskets
Fig. 9: K-424