CHEMICAL CHANGES IK CALCIUM ARSENATE. 



21 



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



Sample ex- 

 amined. 



IT (100 pounds 

 in paper-lined 

 sugar barrel).. 



IS (100 pounds 

 In paper-lined 

 sugar barrel).. 



IS-1 (25 pormds 

 in metal drum) 



IS-3 (25 pounds 

 in paper-lined 

 sugar barrel).. 



Date 

 sampled. 



1920. 

 Apr. 20 

 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 



1222. 

 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 



1920. 

 Apr. 20 

 June 10 

 July 14 

 Aug. 14 



Period 



of 

 stor- 



Mos. 



0.5 

 1.7 



2.8 

 3.8 

 4.9 



5.8 

 6.9 

 7.8 



a* 

 11.4 



14.3 



17.3 



20.4 



1.7 



2.8 

 3.8 

 4.9 



5.8 

 6.9 



7.8 



11.4 

 14.3 

 17.3 



20.4 



1.7 



2.8 

 3.8 

 4.9 

 5.8 

 6.9 

 7.8 



11.4 

 14.3 

 17.3 



20.4 



1.7 



2.8 

 3.8 



Water- 

 soluble 

 arsenic 



oxid 

 (AS2O,). 



Per ct. 

 0.08 

 .07 

 .06 

 .07 

 .07 

 .06 

 .05 

 .12 

 .12 



.18 

 .65 

 .42 



.64 



.31 

 .54 

 .77 

 .92 



Car- 

 bon 

 di- 

 oxid 



(CO.2). 



Per ct. 

 5.95 

 5.61 

 5.92 

 6.25 

 5.85 

 6.08 

 5.94 

 6.76 

 6.69 



6.90 

 6.60 

 7.43 



7.18 



7.44 



5.69 

 6.12 

 5.70 

 5.79 

 6.23 

 6.08 

 6.16 

 6.39 



6.46 

 6.49 

 6.26 

 0.42 



6.09 

 6.06 

 5.58 

 5.82 

 5.85 

 5.75 

 5.86 

 5.24 



6.00 

 6.01 

 6.11 

 6.03 



5.78 



6.58 

 6.55 



Sample ex- 

 amined. 



IS-3 (25 pounds in 

 paper-lined sug- 

 ar barrel) (con.). 



IS-4 (25 pounds 

 in hardwood 

 barrel) 



IS-6 (25 pounds 

 in paper-lined 

 veneer drum).. 



JW (50 pounds 

 in metal drum) 



Date 

 sampled. 



1920. 

 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 



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. 25 



1922. 

 Mar. 1 



Period 

 of 



stor- 



Mos. 

 4.9 

 5.8 

 6.9 



7.8 



11.4 

 14.3 

 17.3 



20.4 



1.7 

 2.8 

 3.8 

 4.9 

 5.8 

 6.9 

 7.8 



11.4 

 14.3 

 17.3 



20.4 



1.7 



2.8 

 3.8 

 4.9 

 5.8 

 6.9 

 7.8 



8.8 

 11.4 

 14.3 

 17.3 



20.4 



9.1 



15.3 

 19.4 



22.6 



Water- 

 soluble 

 arsenic 

 oxid 



(AS2O5). 



Per ct. 



0.93 



.93 



.92 



.91 



.37 

 .42 

 .62 

 .79 

 .97 

 .99 

 1.00 

 .96 



.97 

 .92 

 .90 

 .99 



.97 



.30 

 .24 



.30 



.28 

 .26 



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Fre. 41.— IS (100 pounds in paper-lined sugar barrel). 



