6 BULLETIN 1115, U. S. DEPARTMENT OF AGRICULTURE. 



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



Sample ex- 



Date 



P-^od Wa 



ter- 

 ible 



Car- 

 bon 

 di- 

 oxid 



Sample ex- 



Date 



Period 

 of 



"Water- 

 soluble 



Car- 

 bon 



amined. 



sampled. 



age- '- 



nlc 

 id 



amined. 



sampled. 



stor- 



arsenic 

 oxid 



di- 

 oxid 







^Se- (Ass 



O5). 



(CO2). 







age. 



(AS2O6). 



(CO2). 



AW (100 pounds 











AS-2 (25 pounds 











in hardwood 



1920. 



Mos. Pa 



■ct. 



Perct. 



inunlined su- 



1920. 



Mos. 



Per ct. 



Perct. 



barrel) 



Apr. 12 

 June 23 



( 



08 



1.78 

 1.88 



gar barrel) 



Apr. 20 

 June 10 





0.06 

 .03 



2.94 

 3.04 





"'2.4' 



!07 



■■--■ 















July 14 



2.8 



.05 



3.85 





1921. 











Aug. 14 



3.8 



.04 



4.11 





Jan. 14 



9.1 



.07 



1.90 





Sept. 17 



4.9 



.07 



4.41 





July 20 



15.3 



.10 



1.84 





Oct. 15 



5.8 



.07 



4.94 





Nov. 25 



19.4 



.08 



1.92 





Nov. 17 

 Dec. 15 



6.9 



7.8 



.13 

 .17 



4.97 

 5.50 





1922. 





















Mar. 1 



22.6 



.08 







1921. 

 Jan. 15 



8.8 



.17 



5.57 



AT (200 pounds 













Apr. 2 



11.4 



.25 



5.81 



in hardwood 



1919. 











Jiily 1 



14.3 



.30 



6.23 



barrel) 



Dec. 1 





.02 



2.38 





Oct. 1 



17.3 



.33 



6.08 





1920. 











1922. 







Jan. 8 



1.2 



.05 



2.35 





Jan. 2 



20.4 



.35 



6.20 





Feb. 6 



2.2 



.05 



2.36 















Mar. 6 



3.2 



.02 



2.41 



AS-3 (25 pounds 













Apr. 7 



4.2 



.03 



2.41 



in paper-lined 



1920. 











May 4 



5.1 



.05 



2.46 



sugar barrel)... 



Apr. 20 





.05 



2.93 





June 10 



6.3 



.04 



2.70 





June 10 



'"i'.V 



.05 



3.56 





■July 14 



7.4 



.05 



2.84 





July 14 



2.8 



.04 



3.27 





Aug. 14 



8.4 



05 



2.99 





Aug. 14 



3.8 



.05 



4.22 





Sept. 17 



9.5 



.05 



2.55 





Sept. 17 



4.9 



.07 



4.51" 





Oct. 15 



10.5 



06 



2.58 





Oct. 15 



5.8 



.05 



4.04 





Nov. 17 



11.5 



05 



3.18 





Nov. 17 



6.9 



.24 



5.74 





Dee. 15 



12.5 



06 



3.28 





Dec. 15 



7.8 



.20 



5.65 





1921. 











1921. 











Jan. 15 



13.5 



05 



3. ,52 





Jan. 15 



8.8 



.25 



5.80 





Apr. 2 



16.0 



04 



3.11 





Apr. 2 



11.4 



.34 



6.03 





July 1 



19.0 



08 



4.12 





July 1 



14.3 



.30 



6.04 





Oct. 1 



22.0 



17 



4.88 





Oct. 1 



17.3 



.33 



6.15 





1922. 











1922. 











Jan. 2 



25.0 



10 



3.55 





Jan. 2 



20.4 



.37 



6.24 



AS (50 pounds in 











AS-4 (25 pounds 











hardwood bar- 



1920. 









in hardwood 



1920. 









rel) 



Apr. 20 

 June 10 





08 

 02 



2.78 

 2.53 



barrel) 



Apr. 20 

 June 10 





.05 



2.83 

 3.15 





"'i.'7' 





"'i.'?" 



!06 





July 14 



2.8 



03 



2.72 





July 14 



2.8 



.07 



4.18 





Aug. 14 



3.8 



02 



2.64 





Aug. 14 



3.8 



.07 



4.82 





Sept. 17 



4.9 



04 



2.65 





Sept. 17 



4.9 



.26 



5.83 





Oct. 15 



5.8 



02 



2.72 





Oct. 15 



5.8 



.37 



6.18 





Nov. 17 



6.9 



02 



2.64 





Nov. 17 



6.9 



.38 



6.14 





Dec. 15 



7.8 



05 



3.26 





Dec. 15 



7.8 



.38 



6.22 





1921. 











1921. 











Jan. 15 



8.8 



05 



3.13 





Jan. 15 



8.8 



.37 



6.02 





Apr. 2 



11.4 



06 



3.42 





Apr. 2 



11.4 



.36 



6.10 





JuJy 1 



14.3 



09 



4.64 





July 1 



14.3 



.39 



6.22 





Oct. 1 



17.3 



07 



4.53 





Oct. 1 



17.3 



.42 



6.18 





1922. 











1922. 











Jan. 2 



20.4 



15 



5.30 





Jan. 2 



20.4 



.44 



6.49 



AS-1 (25 pounds 



1920. 









AS-5 (25 pounds 











in metal drum) 



Apr. 20 



■■■-- 



07 



2.92 



in unUned ve- 



1920. 











June 10 





03 



2.85 



neer drum) 



Apr. 20 



■■--- 



.05 



3.01 





July 14 



2.8 



03 



2.50 





June 10 

 July 14 



2.8 



.03 

 .04 



2.87 

 3.19 





Aug. 14 



3.8 



02 



2.47 





Aug. 14 



3.8 



.05 



3.66 





Sept. 17 



4.9 



02 



2.46 





Sept. 17 



4.9 



.05 



3.68 





Oct. 15 



5.8 



02 



2.62 





Oct. 15 



5.8 



.02 



3.64 





Nov. 17 



6.9 



02 



2.53 





Nov. 17 



6.9 



.05 



3.95 





Dec. 15 



7.8 



04 



2.76 





Dec. 15 



7.8 



.07 



4.59 





1921. 











1921. 











Jan. 15 



8.8 



05 



2.83 





Jan. 15 



8.8 



.12 



5.04 





Apr. 2 



11.4 



05 



2.78 





Apr. 2 



11.4 



.19 



5.28 





July 1 



14.3 



05 



2.60 





July 1 



14.3 



.20 



5.78 





Oct. 1 



17.3 



05 



2.52 





Oct. 1 



17.3 



.31 



5.86 





1922. 











1922. 











Jan. 2 



20.4 



04 



2.58 





Jan. 2 



20.4 



.35 



6.03 



