﻿ABSORPTION OF HYDROCYANIC ACID. 

 Table 7. — Hydrocyanic acid (parts per million) in fumigated flour. 



13 



Sodium 

 cyanide. 



Number 

 of times 

 chamber 

 was evac- 

 uated. 



Hydrocyani 



2 acid after 





day. 



1 day. 



4 days. 



7 days. 



Oz. per 

 lOOcu.ft. 

 1 





 1 

 2 

 3 







1 

 2 

 3 







1 

 2 

 3 





 1 

 2 

 3 





None. 

 None. 

 None. 







1 









1 









1 





None. 



None. 

 0.8 



None. 

 None. 





2 



50 

 83 

 83 

 83 



33 

 150 



50 

 120 



100 

 170 

 200 

 170 



2.5 

 3.3 

 8.3 

 3.3 



None. 

 3.3 

 4.2 

 6.6 



3.3 

 6.6 

 8.3 

 3.3 





2 



None. 



2 



2 





4 





4 



None. 

 None. 

 None. 



.8 



.8 



.8 



None. 





4 





4 





6 



None. 

 None. | 

 None. ' 



6 



6 



6 







Table 8. — Hydrocyanic acid (parts per million) in fumigated wheat. 



Sodium 

 cyanide. 



Number 

 of times 

 chamber 

 was evac- 

 uated. 



Hydrocyanic acid after— 



Oday. 



1 day. 



4 days. 



7 days. 



14 days. 



30 days. 



60 days. 



90.days. 



Oz. per 

 100 cu. ft. 



1 



1 



1 



1 



2 



2 



2 



2 



4 



4 



4 



4 



6 



6 



6 



6 





 1 

 2 

 3 





 1 

 2 

 3 







1 

 2 

 3 





 1 

 2 

 3 





5.0 

 4.2 

 4.2 



3.3 

 3.3 

 3.3 

 2.5 



3.7 

 5.0 

 3.3 

 3.3 



6.6 

 5.8 

 5.0 

 6.6 



3.3 

 5.8 

 6.6 

 6.6 



2.5 

 2.5 



2.5 

 2.5 



3.3 

 4.2 

 2.5 

 3.3 



5.0 



4.2 

 4.2 

 4.2 



3.3 

 5.8 

 5.0 



5.8 



1.7 

 1.7 

 1.7 

 1.7 



2.5 

 3.3 

 2.5 

 3.3 



4.2 

 4.2 

 4.2 

 4.2 



3.3 

 5.8 

 5.0 

 5.8 



1.2 

 1.7 

 1.7 

 1.7 



2.1 

 3.3 

 2.5 

 2.9 



4.2 

 3.3 

 4.2 

 4.2 



2.5 

 5.0 

 4.2 

 4.2 



1.2 

 1.7 

 1.2 

 1.7 



2.1 

 2.1 

 2.1 

 2.9 



4.2 

 2.9 

 4.2 

 3.3 



2.9 

 5.0 

 4.2 



4.2 



1.2 

 1.7 

 1.7 

 1.7 



2.1 



1.7 

 1.7 

 2.1 



3.3 

 2.9 

 3.3 

 2.9 



2.5 

 4.2 

 3.3 

 3.3 









17 

 21 

 13 

 13 



17 

 25 

 17 

 17 



17 

 25 

 33 

 25 



8.3 

 6.6 

 5.0 

 3.3 



6.6 

 6.6 

 6.6 

 8.3 



5.0 

 6.6 

 6.6 

 6.6 



sipation, a very small quantity of the fumigant being present at the 

 end of the 3-month experimental period in all but a few cases. 



The flour differed from the seeds in that, while it at first took up a 

 large quantity of hydrocyanic acid, the union seems to have been 

 extremely weak and by the end of four days, or, at most, a week, no 

 traces of it could be found. 



Evacuating the fumigation chamber once, twice, or three times to 

 get rid of the fumigant did not have much effect. In fact, a sample 

 from the series in which the chamber had been evacuated two or three 

 times frequently had a higher gas content than the corresponding 

 sample in the series in which the chamber had not been evacuated. 



