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Text: Deutsch English |
 | The Efficiency of Prussic Acid Fumigation at Low Temperatures |   |
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External temperature: -12°C
Room temperature at the gas measurement locations: -6 to -8°C
Measured gas concentrations
| 1st measurement location | | 2nd measurement location | |
|---|---|---|---|---|
| after 1 hour | 4,48 g HCN | 9,80 g HCN | ||
| " 2 hours | 6,36 g " | 8,00 g " | ||
| " 3 " | 5,77 g " | 6,80 g " | ||
| " 4 " | 4,86 g " | 5,40 g " | ||
| " 5 " | 3,78 g " | 4,30 g " | ||
| " 6 " | 3,30 g " | 3,70 g " | ||
| " 7 " | 2,80 g " | 3,10 g " | ||
| " 8 " | 2,50 g " | 2,60 g " | ||
| " 10 " | 2,00 g " | 2,00 g " | ||
| " 24 " | 0,70 g " | 0,60 g " | ||
| " 48 " | 0,15 g " | 0,15 g " |
2. Barracks building B (economics building), area 4311 cbm
Zyklon consumption 43.2 kg CN = 10 g/cbm
Gas applied 20 January 1941, morning 10:15
External temperature +6 to +9°C
Room temperature at the gas measurement locations: -4°C
(cellar), -5°C (upper ground floor)
Measured gas concentrations
| 1st measurement location | | 2nd measurement location | |
|---|---|---|---|---|
| after 1 hour | 2,32 g HCN | 4,59 g HCN | ||
| " 2 hours | 3,56 g " | 5,24 g " | ||
| " 3 " | 4,21 g " | 5,35 g " | ||
| " 4 " | 4,32 g " | 5,29 g " | ||
| " 5 " | 4,37 g " | 5,24 g " | ||
| " 6 " | 4,21 g " | 5,02 g " | ||
| " 7 " | 4,00 g " | 4,75 g " | ||
| " 8 " | 3,82 g " | 4,60 g " | ||
| " 24 " | 1,51 g " | 1,51 g " |
From these analytical values, the following can be derived:
1. In all cases, the essential part of the disengagement of the gas is complete after one or at most two hours. (A control of the residues at the applicable times confirmed their complete degassing.) The evaporation of the prussic acid was therefore not significantly delayed by the low temperature.
2. The obtained concentrations of gas did not distinguish themselves considerably from those achieved in buildings of a similar nature and measured on earlier occasions.
That, in addition, the dispersion and reaction of the gas in the given temperature conditions were sufficient at a normal dosage of 10 g prussic acid per cbm was confirmed through suitable biological controls. All test specimens, set out at various elevations, that were removed from the gas after 24 hours were without exception 100 per cent killed, including the most resistant larva phases.
Experiments in the laboratory
In the current apparatus that has already been described many times, the most highly resistant bugs and bug larvae
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Text: Deutsch English |
| The Efficiency of Prussic Acid Fumigation at Low Temperatures | |
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Last modified: October 10, 1998
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