10
Digestion Unit K-4355 Operation
Hot, caustic sulfuric acid is used for the operation of this
apparatus. For this reason, protective goggles must be worn
at all times when using this apparatus or working in its
immediate proximity. Close unused connections with plug caps
(Art. No. 17396).
It is absolutely essential that the seals on the suction pipes be
properly installed and fit the glass evenly!
The proper heat setting is dependent on various factors such
as the digestion quantity, the type of reagents, etc.
Normally digestion of the samples will be conducted at the full
setting in order to minimize the amount of time needed for the
procedure.
The digestion time depends on the material being digested
and must be determined by actual practice (continue boiling
the solution for approximately 15 minutes after it has become
clear). After the sample has cooled, the digestion glass can
be connected directly to a Büchi Distillation Unit for distilling.
If the digested samples are allowed to cool for a long period of
time, the sample will occasionally solidify.
Before it can be distilled, the sample must be liquefied again:
• by carefully adding a small quantity of distilled water, or
• by slightly warming it in the Digestion Unit.
Figure 8: Seals
Figure 9: K-435
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