18 BULLETIN 1115, U. S. DEPARTMENT OF AGEICULTUEE. 



Table 2. — Effect of storage on chemical composition of calcium arsenate — Continued. 



Sample ex- 

 amined. 



Date 

 sampled. 



Period 



of 

 stor- 



Water- 

 soluble 

 arsenic 

 oxid 



Car- 

 bon 

 di- 

 oxid 



Sample ex- 

 amined. 



Date 

 sampled. 



Period 

 of 



stor- 



Water- 

 soluble 

 arsenic 

 oxid 



Car- 

 bon 

 di- 

 oxid 







age 



(AS2O5). 



(CO2). 







age. 



(AS2O5). 



(COo). 



rS-5 (25 pounds 











HS (100 pounds 











in unlined ve- 



1920. 



3fos. 



Per ct. 



Per ct. 



in hardwood 



1920. 



Per ct. 



Per ct. 



Per ct. 



neer drum) 



Apr. 20 

 Jime 10 





0.05 



1.90 



barrel)......... 



Apr. 20 

 June 10 





0.10 



1.07 



""i.Y 



.06 



1.96 





'"{'.Y 



.05 



.95 





July 14 



2.8 



.05 



1.88 





July 14 



2.8 



.04 



.88 





Aug. 14 



3.8 



.05 



2.26 





Aug. 14 



3.8 



.02 



.98 





Sept. -17 



4.9 



.06 



2.53 





Sept. 17 



4.9 



.02 



.85 





Oct. 15 



5.8 



.05 



2.68 





Oct. 15 



5.8 



.02 



1.02 





Nov. 17 



6.9 



.07 



2.95 





Nov. 17 



6.9 



.02 



1.04 





Dec. 15 



7.8 



.06 



2.98 





Dec. 15 



7.8 



.04 



1.28 





1921. 











1921. 











Jan. 15 



8.8 



.06 



3.28 





Jan. 15 



8.8 



.02 



.94 





Apr. 2 



11.4 



.05 



3.08 





Apr. 2 



11.4 



.02 



1.48 





July 1 



14.3 



.08 



4.36 





July 1 



14.3 



.02 



1.54 





Oct. 1 



17.3 



.09 



4.77 





Oct. 1 



17.3 



.02 



1.51 





1922. 











1922. 











Jan. 2 



20.4 



.22 



5.38 



HS-1 (25 pounds 

 in metal drum) 



Jan. 2 



1920. 

 Apr. 20 



20.4 

 ....... 



.07 

 .11 



1.69 

 1.25 



FS-6 (25 pounds 













June 10 





.04 



1.00 



in paper-lined 



1920. 











July 14 



2.8 



.04 



.97 



veneer drum).. 



Apr. 20 





.06 



1.93 





Aug. 14 



3.8 



.02 



.92 





June 10 



"i'Y 



.05 



2.16 





Sept. 17 



4.9 



.02 



.93 





July 14 



2.8 



.05 



2.34 





Oct. 15 



5.8 



.02 



.95 





Aug. 14 



3.8 



.05 



2.35 





Nov. 17 



6.9 



.02 



1.22 





Sept. 17 



4.9 



.06 



2.30 





Dec. 15 



7.8 



.02 



1.18 





Oct. 15 



5.8 



.05 



2.62 















Nov. 17 



6.9 



.07 



3.48 





1921. 











Dec. 15 



7.8 



.07 



3.79 





Jan. 15 

 Apr. 2 



8.8 

 11.4 



.02 

 .02 



.98 

 .97 





1921. 











July 1 



14.3 



.02 



.93 





Jan. 15 



8.8 



.07 



4.06 





Oct. 1 



17.3 



.02 



1.01 





Apr. 2 



11.4 



.08 



3.80 















July 1 



14.3 



.12 



5.17 





1922. 











Oct. 1 



17.3 



.33 



5.51 





Jan. 2 



20.4 



.05 



1.02 





1922. 









HS-4 (25 pounds 

 in hardwood 













Jan. 2 



20.4 



.39 



5.23 



1920. 



















barrel). ••..... . 



Apr. 20 

 June 10 





.11 



1.08 















""I'.Y 



.05 



1.06 



HW (50 pounds 

 in hardwood 



1920. 











July 14 

 Aug. 14 



2.8 

 3.8 



.05 

 .05 



1.11 

 1.20 



barrel) 



Apr. 12 

 June 23 



■"il" 



.11 

 .08 



.87 

 .90 





Sept. 17 

 Oct. 15 

 Nov. 17 



4.9 

 5.8 

 6.9 



.02 

 .02 

 .02 



1.07 





1.06 

 1..52 





1921. 











Dec. 15 



7.8 



.02 



1.66 





Jan. 14 



9.1 



.09 



.93 





1921. 

 Jan. 15 

 Apr. 2 











July 20 

 Nov. 25 



15.3 

 19.4 



.07 

 .07 



1.07 

 .97 





8.8 

 11.4 



.02 

 .02 



1.34 

 1.38 





1922 











July 1 



14.3 



.02 



2.52 





Mar. ' 1 



22.6 









Oct. 1 

 1922. 



17.3 



.02 



1.88 























Jan. 2 



20.4 



.07 



1.81 



HT (100 pounds 





















in hardwood 



1920. 









HS-6 (25 pounds 











barrel) 



Apr. 20 

 May 4 





.10 



1.33 



in paper-lined 

 veneer drum).. 



1920. 











........ 



.07 



.84 



Apr. 20 





.11 



1.05 





June 10 



1.7 



.06 



.86 





June 10 



'"i'.Y 



.05 



1.02 





July 14 



2.8 



.04 



.97 





July 14 



2.8 



.07 



1.15 





Aug. 14 



3.8 



.02 



.99 





Aug. 14 



3.8 



.05 



1.10 





Sept. 17 



4.9 



.02 



.91 





Sept. 17 



4.9 



.02 



1.22 





Oct. 15 



5.8 



.02 



1.25 





Oct. IS 



5.8 



.05 



1.28 





Nov. 17 



6.9 



.02 



1.52 





Nov. 17 



6.9 



.02 



1.48 





Dec. 15 



7.8 



.02 



2.35 





Dec. 15 



7.8 



.02 



2.24 





1921. 











1921. 











Jan. 15 



8.8 



.02 



1.94 





Jan. 15 



8.8 



.02 



1.87 





Apr. 2 



11.4 



.02 



2.92 





Apr. 2 



11.4 



.02 



1.78 





July 1 



14.3 



.05 



2.87 





July 1 



14.3 



.04 



2.56 





Oct. 1 



17.3 



.04 



2.77 





Oct. 1 



17.3 



.05 



3.09 





1922. 











1922. 











Jan. 2 



20.4 



.12 



3.72 





Jan. 2 



20.4 



.07 



3.15 



