Excursus 2 HCN Loss due to Adsorption

Graph 12 Hydrogen cyanide concentration behavior in delousing chamber with and without circulating air systems, measuring points always in center of room (intern, correspondence of DEGESCH values at various points differed greatly)122  

Graph 13 Hydrogen cyanide concentration behavior in disinfestation chamber with and without clothes at room temperature.409  

The loss of hydrogen cyanide as a function of temperature in a disinfestation chamber can be seen in Graph 14. The higher losses at lower temperatures is caused by a higher moisture content in the gassed material and in the walls of the observed room.123 

According to the already quoted publication by Schwarz et ctl, 4IJ9 their measurements were made in the range of room temperature. Although the interesting part of Graph 13 is only poorly resolved, it is nevertheless clear that under these circumstances the maximum concentration is reached as late as 4 to 5 hours after the start. In these 

Graph 14 Relation between hydrogen cyanide adsorption on clothing and temperature in a delousing chamber with circulating air system (schematic).123 

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