IKA C 5000 control Package 2/12 User Manual
Page 72
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The capsules described above, or combustion bags made of polyethylene (see ac-
cessories) can also be used as combustion aids for substances with low inflamma-
bility or low-calorific substances. The combustible crucible C 14 can also be used.
Before the capsules or the combustion bags can be filled with the substance to be
determined, they must be weighed to be able to calculate (from the weight and the
gross calorific value) the additional extraneous energy (see scale mode
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amount of combustion aid used should be as little as possible.
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Almost all substances that will need to be analyzed contain sulfur and nitrogen.
Sulfur and nitrogen are reduced under the pressures and temperatures prevailing in
the decomposition vessel to SO
2
, SO
3
and NO
x
. In combination with the resulting
water of combustion, sulfuric acid, nitric acid and heat of solution are generated.
This resulting heat of solution is taken into account as specified in DIN 51900 when
calculating the gross calorific value. In order to record and determine all resulting
acids quantitatively, 5 ml of distilled water can be placed in the decomposition ves-
sel before the experiment.
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After the combustion, this water must be collected and the decomposition vessel
must be thoroughly rinsed with distilled water. The rinsing water and the water that
was present are combined and titrated for their acid content (see DIN 51900). If the
sulfur content of the combustion material and the nitric acid correction are already
known, the water does not need to be analyzed.
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