CHEMICAL CHANGES IN CALCIUM ARSENATE. 



25 



Table 3. — Effect of type of container on chemical composition of calcium arsenate during 



storage. 









Water- 











Water- 





Type of con- 

 tainer. 



Date 

 sampled. 



Period 



ofstor- 



age. 



soluble 

 arsenic 



oxid 

 (AS2O6) 



Carbon 

 dioxid 

 (CO 2). 



Type of con- 

 tainer. 



Date 

 sampled. 



Period 

 of stor- 

 age. 



soluble 

 arsenic 



oxid 

 (AS2O5) 



Carbon 

 dioxid 

 (CO 2). 



Metal drums 











Hardwood bar- 











(samples AS- 











rels (samples 











1, BS-1, CS-1, 











AS-4, BS-4, 











FS-1, HS-1, 



1920. 



Mos. 



Per ct. 



Perct. 



CS-4, FS-4, 



1920. 



Mos. 



Per ct. 



Per a. 



IS-1) 



Apr. 20 

 Jime 10 





0-18 



3.69 



HS-4, IS-4)... 



Apr. 20 

 June 10 





0.17 



3.54 





1.7 



.14 



3.45 



1.7 



.16 



3.54 





July 14 



2.8 



.13 



3.26 





July 14 



2.8 



.15 



3.67 





Aug. 14 



3.8 



.13 



3.39 





Aug. 14 



3.8 



.17 



3.91 





Sept. 17 



4.9 



.15 



3.30 





Sept. 17 



4.9 



.22 



3.91 





Oct. 15 



5.8 



.13 



3.33 





Oct. 15 



5.8 



.23 



4.06 





Nov. 17 



6.9 



.13 



3.40 





Nov. 17 



6.9 



.26 



4.37 





Dec. 15 



7.8 



.14 



3.38 





Dec. 15 



7.8 



.29 



4.51 





1921. 











1921. 











Jan. 15 



8.8 



.14 



3.53 





Jan. 15 



8.8 



27 



4.47 





Apr. 2 



11.4 



.14 



3.45 





Apr. 2 



11.4 



.31 



4.49 





July 1 



14.3 



.13 



3. ,54 





July 1 



14.3 



.32 



4.86 





Oct. 1 



17.3 



.14 



3.36 





Oct. 1 



17.3 



.42 



5.06 





1922. 











1922. 











Jan. 2 



20.4 



.16 



3.33 





Jan. 2 



20.4 



.46 



5.09 



Paper-lined 











Paper-lined 











sugar barrels 











veneer dnims 











(samples AS- 











(samples AS- 

 6, BS-6, CS-6, 











3, BS-3, CS-3, 



1920. 

















FS-3, lS-3).... 



Apr. 20 





.18 



4.00 



rS-6, HS-6, 



1920. 











June 10 



1.7 



.26 



4.41 



IS-6) 



Apr. 20 





.16 



3.53 





July 14 



2.8 



.32 



4.77 





June 10 



. 1.7 



.16 



3.56 





Aug. 14 



3.8 



.41 



5.29 





July 14 



2.8 



.20 



3.56 





Sept. 17 



4.9 



.47 



5.50 





Aug. 14 



3.8 



.23 



3.74 





Oct. 15 



5.8 



.45 



5.46 





Sept. 17 



4.9 



.28 



3.81 





Nov. 17 



6.9 



.50 



6.09 





Oct. 15 



5.8 



.26 



3.73 





Dec. 15 



7.8 



.49 



6.27 





Nov. 17 

 Dec. 15 



6.9 



7.8 



.29 

 .29 



4.29 



. 4.58 





1921. 





















Jan. 15 



8.8 



.52 



6.27 





1921. 











Apr. 2 



11.4 



.55 



6.25 





Jan. 15 



8.8 



.32 



4.69 





July 1 



14.3 



.55 



6.31 





Apr. 2 



11.4 



.31 



4.65 





Oct. 1 



17.3 



.55 



6.34 





July 1 

 Oct. 1 



14.3 

 17.3 



.37 

 .45 



5.34 

 5.51 





1922. 



















Jan. 2 



20.4 



.60 



6.45 





1922. 

 Jan. 2 



20.4 .62 



5.51 



7.0 

 6jO 



^3.0 

























































•< — 



© 



cor" 



5-^^ 



©ner® 



©•©— ' 



-©— ' 



-a.». 



-©-« 



n> 











































<SUi 



3-e^^ 



©-©-© 







y^ 



-©— 



-( 





^ 



0.8 



0.6^ 

 0.4-%^ 



AO I i .ts L _ 1^ - L . 4-. :— I i . ! 1 0.2 



O 



Fig. 47.— Aver age results with AS-1, BS-i, CS-1, FS-1, HS-l, IS-1 (metal drums;, 



