6.2.4 TIC-module Operation procedure
1. Place the empty glass flask (6) on the balance.
2. Press tare.
3. Put the sample into the flask and enter the weight into the analyzer (F4- button).
4. Place a magnetic stirrer into the flask and attach the flask
to the distributor (3).
5. Raise the adjustable platform to support the flask. Check, and if necessary, readjust the
flask so that its bottom lies flat on the heated platform.
6. Switch to TIC-mode with the TIC/TC toggle (13).
7. Start analysis (F5 or click START).
8. Inject acid in two or three doses, when the word “Analyzing” appears.
9. When all the CO2 has been released from the sample, the analyzer's signal will return to
the baseline level and the analysis will be terminated.
10. switch to TC-mode with the TIC/TC toggle (13).
NOTICE
The rotary speed of the stirrer should be kept low. The rotary speed and the acid dosing should
be done in a way to avoid sample particles being pushed up and stick on the inner glass
surface.
The heater must be switched on. Do not allow boiling or evaporation of the solution in the flask!
The table below shows approximate sample weight and acid volume depending on the
expected TIC content in the sample.
Used Acids:
Acetic acid 25% concentration or Phosphoric acid 50% concentration.
NOTICE
Only the carbon of easily decomposable carbonates can be determined. Carbonates which are
difficult to decompose cannot be measured. For example, elementary carbon (graphite, soot)
and cyanides cannot be analyzed.
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