IKA C 7000 Grundausstattung Set 2 - Manual (Page 44)

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culated. The quantity of this external energy must be known for the calculation, and
must be entered with the pre-test parameters ( SUHSDU ) as TH[WU  . The quantity of
combustion aid used should be kept as small as possible.
Almost all substances to be analysed contain some sulphur and nitrogen. Under the
pressure and temperature conditions in the decomposition vessel, they burn to form
SO
2
, SO
3
and NO
x
. In combination with water formed during combustion, they form
sulphuric and nitric acids, and produce heat of solution. This heat of solution is taken
into account in the calculation as described in DIN 51900. To be sure that all acids
formed are quantitatively assessed, ca. 5 to 10 ml of distilled water or other suitable
absorption liquid can be added to the decomposition vessel before the test.
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After combustion, the water is collected and the decomposition vessel thoroughly
rinsed with distilled water. The rinsing water and the collected water are mixed, and
their acid content investigated. If the sulphur content of the fuel and the nitric acid
correction are known, analysis of the water is unnecessary.
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