TABLE V. CONCENTRATIONS OF HYDROGEN CYANIDE AND/OR ITS
COMBINATIONS IN MATERIALS SAMPLED 48 HOURS AFTER FUMIGATION
---------+-------------+--------------+--------------+-------------
|Fresh plaster| Old mortar | New brick | Old brick
---------+----+--------+-----+--------+-----+--------+-----+-------
Sort of |dry | wetted | dry | wetted | dry | wetted | dry | wetted
material | | | | | | | |
---------+----+--------+-----+--------+-----+--------+-----+-------
Concentration | | | | | | |
of CN~ in | | | | | | |
µg/kg | 24 | 480 | 176 | 2700 | 4 | 52 | 20 | 0
---------+----+--------+-----+--------+-----+--------+-----+-------
After a lapse of one month the concentration of hydrogen
cyanide and its combinations in the materials examined
decreased on the average by 56% (from 28% to 86%). An
apparent rise in the concentration occurred only in single
samples. That is so because the samples used for examination
were not always the same. When they had been used up in the
first run, they had to be replaced by new samples taken from
the same bigger lumps of material. This supports the thesis
on the local binding of hydrogen cyanide.
The results obtained in the next series of tests, in which
the materials were subjected to gassing with a mixture of
HCN + CO² are presented in
Table VI.
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