﻿DRY SUBSTITUTES FOR LIQUID LIME-SULPHUR 17 



Table 11. — The chemical composition of representative dry sodium-sulphurs 



Sample 

 . No. 



Sodium 

 polysul- 

 phide > 



Sodium 

 thiosul- 

 phate 2 



Free 

 sul- 

 phur 



Other 

 ingre- 

 dients 

 by differ- 

 ence 3 



Sample 

 No. 



Sodium 

 polysul- 

 phide 1 



Sodium 

 thisoul- 

 phate 2 



Free 

 sul- 

 phur 



Other 

 ingre- 

 dients 

 by differ- 

 ence 3 



1-- 



Per cent 

 55.11 

 58.21 

 72.00 

 60.18 

 52.83 

 56.84 

 68.30 

 55.13 



Per cent 

 41.93 

 39.20 

 7.67 

 25.87 

 40.74 

 36.56 

 10.80 

 40.80 



Per cent 



0.13 



.54 



.99 



1.25 



.48 



3.38 



1.39 



1.56 



Per cent 

 2.83 

 2.05 

 19.34 

 12.70 

 5.95 

 3.22 

 19.51 

 2.51 



9 - 



Per cent 

 41.13 

 40.91 

 43.55 

 41.99 

 61.53 

 2.12 

 10.96 



Per cent 

 50.52 

 49.43 

 29.39 

 41.45 

 29.35 

 60.00 

 61.60 



Per cent 

 0.67 

 .35 

 20.03 

 10.33 

 .34 

 18.94 

 17.54 



Per cent 

 7.68 



2 



10-_ 



9.31 



3 



11 - 



7.03 



4 



12 



6.23 



5. 



13 



8.78 



6 - 



14 



18.94 



7 



15 



9.90 



8 .- 











1 Polysulphide sulphur calculated to sodium polysulphide (Na2Sx). 

 ' Thiosulphate sulphur calculated to sodium thiosulphate (Na2S203). 

 3 Mainly water. 



It will be noted that these products are extremely variable in 

 composition, the sodimn polysulphide varying from 2.12 to 72 per 

 cent, sodium thiosulphate from 7.67 to 61.6 per cent and free sulphur 

 from 0.13 to 20 per cent. 



A comparison of the composition of the liquid lime-sulphurs and 

 the sodium-sulphur compounds shows that the latter contain 

 roughly about 1^^ times as much polysulphides; from 15 to 25 times 

 as much thiosulphates; and, in addition, varjring quantities of free 

 sulphur, which does not occur in liquid lime-sulphur solution. 



The analysis of more than 100 commercial lime-sulphur solutions 

 indicates the presence of a predominating percentage of the penta- 

 sulphide (CaSs). In the case of the sodium-sulphur preparations they 

 show such wide variations in composition that no general statement 

 can be made in regard to the sodium polysulphide that may predomi- 

 nate, although some of them apparently contain sulphur in the 

 pentasulphide form. 



Table 12 gives the chemical composition of the dry sodium-sulphur 

 preparations that were tested in experiments against the San Jose 

 scale. These experiments were carried on under the same general 

 conditions as those described for the dry calcium-sulphur tests which 

 have already been discussed. For the details of these tests refer- 

 ence should be made to the dry calcium-sulphur experiments under 

 the corresponding locality and date. 



Table 12. — The chemical composition of the dry sodium sulphur preparations tested 





Percentage of— 



Pounds 

 used in 50 



gallons 

 ^ of spray 



Pounds 

 of poly- 

 sul- 

 phides 

 in 50 

 gallons 



Sample No. 



Sodium 

 poly- 

 sul- 

 phides 



Sodium 



thio- 

 sulphate 



Free 

 sulphur 



Sodium 

 sulphate 



Insoluble 



residue 



and 



water 



1 



59.71 

 59.71 

 r,9. 71 

 6L26 

 61.26 

 61.26 

 60.53 

 60.63 



25.79 

 25. 79 



2.64 

 2. 54 



3.72 

 3.72 

 ;i.72 

 6.09 

 6.09 

 6.00 

 9.21 

 9.21 



8.24 

 8.24 

 8.24 

 2,10 

 2.10 

 2.16 

 4.43 

 4.43 



12.6 



19. 



25 



12.6 



19 



26 



12.6 



27 



7.46 



1 



11.34 



1 



25. 79 2. 54 

 23. 95 6. M 

 2:1. 95 6. 54 

 23. 95 6. 54 

 22. 76 3. 07 

 22. 76 3. 07 



14.92 



2 



7.66 



2 



11.63 



2 



16.31 



.3 „ 



7.66 



'6 



16.34 











