CHEMICAL CHANGES IN CALCIUM ARSENATE. 15 



Ta'ble 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). 



(CO2). 



CS-4 (25 poimds 











FS (75 poimds 











in hardwood 



1920. 



Mos. 



Per a. 



Per a. 



in paper-lined 



1920. 



Mos. 



Perct. 



Perct. 



barrel) 



Apr. 20 





0.14 



4. .54 



veneer drum).. 



Apr. 20 





0.04 



1.91 





June 10 



"V.Y 



.19 



4.45 





June 10 



""I'.Y 



.06 



1.85 





July 14 



2.8 



.15 



4.37 





July 14 



2.8 



.06 



2.94 





Aug. 14 



3.8 



.18 



4. 84 





Aug. 14 



3.8 



.07 



3.62 





Sept. 17 



4.9 



.20 



4. .57 





Sept. 17 



4.9 



.07 



2.75 





Oct. 15 



5.8 



.22 



4.92 





Oct. 15 



5.8 



.05 



3.36 





Nov. 17 



6.9 



.25 



5. ,33 





Nov. 17 



6.9 



.10 



4.81 





Dec. 15 



7.8 



.27 



5.36 





Dec. 15 



7.8 



.07 



4.30 





1921. 











1921. 











Jan. 15 



8.8 



.25 



5.32 





Jan. 15 



8.8 



.10 



4.19 





Apr. 2 



11.4 



.40 



.5.75 





Apr. 2 



11.4 



.11 



4.26 





July 1 



14.3 



.42 



6.09 



* 



July 1 



14.3 



.22 



5.54 





Oct. 1 



17.3 



.47 



6.14 





Oct. 1 



17.3 



.26 



5.28 





1922. 











1922. 











Jan. 2 



20.4 



.54 



fi.08 





Jan. 2 



20.4 



.36 



5.75 



CS-5 (25 pounds 



In nnlinp.d ve- 



1920. 









FS-1 (25 pounds 

 in metal drum) 



1920. 

 Apr. 20 





.05 



2.09 



neer drum) 



Apr. 20 





.17 



4.91 





June 10 



"i.7 



.05 



1.72 





June 10 



"""i.'7" 



.16 



4.51 





July 14 



2.8 



.03 



1.64 





July 14 



2.8 



.20 



4.54 





Aug. 14 



3.8 



.05 



1.74 





Aug. 14 



3.8 



.17 



4.94 





Sept. 17 



4.9 



.05 



1.67 





Sept. 17 



4.9 



.34 



5.40 





Oct. 15 



5.8 



.05 



1.88 





Oct. 15 



5.8 



.37 



5.67 





Nov. 17 



6.9 



.05 



1.70 





Nov. 17 



6.9 



.45 



5.72 





Dec. 15 



7.8 



.05 



2.16 





Dec. 15 



7.8 



.46 



6.28 





1921. 

 Jan. 15 











1921. 











8.8 



.05 



1.79 





Jan. 15 



8.8 



.46 



6.36 





Apr. 2 



11.4 



.03 



1.98 





Apr. 2 



11.4 



.46 



6.08 





July 1 



14.3 



.05 



2.36 





July 1 



14.3 



.45 



6.24 





Oct. 1 



17.3 



.05 



1.81 





Oct. 1 



17.3 



.43 



6.07 





1922. 











1922. 











Ian. 2 



20.4 



.05 



1.88 





Jan. 2 



20.4 



.51 



0.91 













CS-6 (25 pounds 

 in paper-lined 



1920. 









FS-3 (25 pounds 

 in paper-Uned 



1920. 









veneer drum).. 



Apr. 20 





.15 



4.80 



sugar barrel)... 



Apr. 20 





.06 



2.01 





June 10 



" i.7 



.16 



4.24 





Jime 10 



i.7 



.08 



2.30 





July 14 



2.8 



.16 



4.24 





July 14 



2.8 



.05 



3.12 





Aug. 14 



3.8 



.17 



4.62 





Aug. 14 



3.8 



.07 



3.49 





Sept. 17 



4.9 



.20 



4.39 





Sept. 17 



4.9 



.09 



3.81 





Oct. 15 



5.8 



.13 



4.56 





Oct. 15 



5.8 



.10 



4.53 





Nov. 17 



6.9 



.24 



5.06 





Nov. 17 



6.9 



.15 



5.32 





Dec. 15 



7.8 



.20 



5.44 





Dec. 15 



7.8 



.15 



5.62 





1921. 











1921. 











Jan. 15 



8.8 



.25 



5.30 





Jan. 15 



8.8 



.25 



5.70 





Apr. 2 



11.4 



.20 



5.29 





Apr. 2 



11.4 



.32 



5.61 





July 1 



14.3 



.39 



5.59 





July 1 



14.3 



.34 



5.74 





Oct. 1 



17.3 



.48 



5.91 





Oct. 1 



17.3 



.32 



5.68 





1922. 











1922. 











Jan. 2 



20.4 



.54 



5.83 





Jan. 2 



20.4 



.41 



5.62 



FT (100 pounds 

 in unlined ve- 



1920. 









FS-4 (25 pounds 











neer drum) — 



Apr. 7 



■■■■■- 



.00 



1.40 



in hardwood 



1920. 











May 4 





.01 



1.44 



barrel) 



Apr. 20 





.05 



2.05 





June 10 



2.1 



.03 



1.62 





June 10 



"'i.'7' 



.05 



1.87 





July 14 



3.2 



.03 



1.65 





July 14 



2.8 



.05 



1.88 





Aug. 14 



4.2 



.03 



1.66 





Aug. 14 



3.8 



.07 



2.00 





Sept. 17 



5.3 



.02 



1.83 





Sept. 17 



4.9 



.06 



2.05 





Oct. 15 



6.3 



.02 



1.94 





Oct. 15 



5.8 



.05 



2.04 





Nov. 17 



7.3 



.02 



2.79 





Nov. 17 



6.9 



.08 



2.06 





Dec. 15 



8.3 



.02 



2.38 





Dec. 15 



7.8 



.05 



2.94 





1921. 











1921. 











Jan. 15 



9.3 



.02 



2.41 





Jan. 15 



8.8 



.06 



2.71 





Apr. 2 



11.8 



.02 



2.52 





Apr. 2 



11.4 



.09 



2.38 





July 1 



14.7 



.05 



3.97 





July 1 



14.3 



.05 



2.72 





Oct. 1 



17.8 



.04 



3.78 





Oct. 1 



17.3 



.07 



3.04 





1922. 











1922. 











Jan. 2 



20.8 



.09 



3.09 





Jan. 2 



20.4 



.07 



3.38 



