CHEMICAL. CHANGES IN CALCIUM ARSENATE. 9 



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



Sample ex- 

 amined. 



AS-6 (25 pounds 

 in paper-lined 

 veneer drum).. 



BW (100 pounds 

 in paper-lined 

 sugar barrel)... 



BT (100 pounds 

 in hardwood 

 barrel) 



BS (50 pounds in 

 paper - lined 

 sugar barrel)... 



Date 

 sampled. 



1920. 

 Apr. 20 

 June 10 

 July 14 

 Aug. 14 

 Sept. 17 

 Oct. 15 

 Nov. 17 

 Dec. 15 



1921. 

 Jan. 15 

 Apr. 2 



July 1 

 Oct. 1 



1922. 

 Jan. 2 



1920. 

 Apr. 12 

 June 23 



1921. 

 Jan. 14 

 July 20 

 Nov. 26 



1922. 

 Mar. 1 



1919. 

 Dec. 1 



1920. 

 Jan. 8 

 Feb. 6 

 Mar. 6 

 Apr. 7 

 May 4 

 June 10 

 July 14 

 Aug. 14 

 Sept. 17 

 Oct. 15 

 Nov. 17 

 Dec. 15 



1921. 

 Jan. 15 

 Apr. 2 

 July 1 

 Oct. 1 



1922. 

 Jan. 2 



1920. 

 Apr. 20 

 June 10 

 July 14 

 Aug. 14 

 Sept. 17 

 Oct. 15 

 Nov. 17 

 Dec. 15 



1921. 

 Jan. 15 

 Apr. 2 

 July 1 

 Oct. 1 



1922. 

 Jan. 2 



Period 



of 

 stor- 



1.7 



2.8 

 3.8 

 4.9 

 5.8 

 6.9 

 7.8 



11.4 

 14.3 

 17.3 



20.4 



2.4 



9.1 

 15.3 

 19.4 



22.6 



1.2 

 2.2 

 3.2 

 4.2 

 5.1 

 6.3 

 7.4 

 8.4 

 9.5 

 10.5 

 11.5 

 12.5 



13.5 

 16.0 

 19.0 

 22.0 



25.0 



1.7 

 2.8 

 3.8 

 4.9 

 5.8 

 6.9 

 7.8 



11.4 

 14.3 

 17.3 



20.4 



Water- 

 soluble 

 arsenic 



oxid 

 (AS2O5). 



Per a. 

 0.05 

 .03 

 .04 

 .05 

 .02 

 .02 

 .05 

 .06 



.23 



.71 

 1.11 



.20 



Car- 

 bon 

 di- 

 oxid 

 (CO2). 



Per a. 

 2.86 

 2.85 

 2.67 

 2.88 

 3.08 

 2.80 

 3.64 

 3.47 



3.92 

 4.00 

 5.38 

 5.02 



3.44 

 3.47 



3.63 

 3.86 

 4.01 



3.62 



3.68 

 3.68 

 3.70 

 3.76 

 3.70 

 3.98 

 4.01 

 3.82 

 3.80 

 4.28 

 4.36 

 4.82 



4.70 

 4.14 

 4.68 

 4.74 



5.30 

 4.93 

 4.84 

 5.19 

 5.28 

 5.42 

 6.06 

 6.00 



5.97 

 6.01 



6.69 

 7.00 



Sample ex- 

 amined. 



BS-1 (25 pounds 

 in metal drum) 



BS-2 (25 pounds 

 in unlined 

 sugar barrel)... 



BS-3 (25 pounds 

 in paper-Uned 

 sugar barrel)... 



BS-4 (25 pounds 

 in hardwood 

 barrel) 



Date 



Period 

 of 



stor- 



sampled. 





age. 



1920. 



Mos. 



Apr. 20 





June 10 



""'i.'7' 



July 14 



2.8 



Aug. 14 



3.8 



Sept. 17 



4.9 



Oct. 15 



5.8 



Nov. 17 



6.9 



Dec. 15 



7.8 



1921. 





Jan. 15 



8.8 



Apr. 2 



11.4 



July 1 



14.3 



Oct. 1 



17.3 



1922. 





Jan. 2 



20.4 



1920. 





Apr. 20 





June 10 



""i.¥ 



July 14 



2.8 



Aug. 14 



3.8 



Sept. 17 



4.9 



Oct. 15 



5.8 



Nov. 17 



6.9 



Dec. 15 



7.8 



1921. 





Jan. 15 



8.8 



Apr. 2 



11.4 



July 1 



14.3 



Oct. 1 



17.3 



1922. 





Jan. 2 



20.4 



1920. 





Apr. 20 



...... 



June 10 





July 14 



2.8 



Aug. 14 



3.8 



Sept. 17 



4.9 



Oct. 15 



5.8 



Nov. 17 



6.9 



Dec. 15 



7.8 



1921. 





Jan. 15 



8.8 



Apr. 2 



11.4 



July 1 



14.3 



Oct. 1 



17.3 



, 1922. 





Jan. 2 



20.4 



1920. 





Apr. 20 





June 10 



-■'YY 



July 14 



2.8 



Aug. 14 



3.8 



Sept. 17 



4.9 



Oct. 15 



5.8 



Nov. 17 



6.9 



Dec. 15 



7.8 



1921. 





Jan. 15 



8.8 



Apr. 2 



11.4 



July 1 



14.3 



Oct. 1 



17.3 



1922. 





Jan. 2 



20.4 



Water- 

 soluble 

 arsenic 

 oxid 

 (AS2O5). 



Perd. 

 0.35 

 .24 

 .20 

 .17 

 .24 

 .20 

 .22 

 .20 



.21 

 .25 

 .18 

 .19 



.17 



.87 



3835°— 22- 



