May 10, 1924 
Nitrate and Ammonia in Nitrogenous Materials 
533 
Table IV .—Nitrate nitrogen in moisture-free tobacco by the two procedures —Con. 
Number 
Strowd 
method 
Modified 
Strowd 
method 
80132___ 
Per cent 
1. 23 
1. 11 
Per cent 
1. 10 
1 14 
Average___ _ 
1. 17 
1. 12 
80250_... 
. 54 
. 61 
. 64 
. 63 
Average__ ___ 
. 58 
. 64 
80273_ 
. 49 
. 49 
. 54 
. 55 
Average___ _ __ _ 
. 49 
. 55 
80275_ 
. 65 
. 66 
. 66 
. 70 
Average__ _ _ 
. 66 
. 68 
80276_ 
. 87 
. 86 
. 89 
. 85 
Average__ _ 
. 87 
. 87 
80298_ 
. 74 
. 76 
. 81 
. 83 
Average__ _ ____ ___ 
. 75 
. 82 
80332_ 
1. 04 
1. 06 
1. 06 
1. 04 
Average___ __ __ __ 
1. 05 
1. 05 
Of the 28 samples used the modified method gave higher averages on 24, the 
same on 2, and lower on 2 than the other procedure. 
COMPARISON OF THE MODIFIED STROWD AND ULSCH-STREET METHODS 
FOR NITRATE IN FERTILIZERS 
The samples were obtained from the fertilizer department and were selected 
chiefly on account of their containing ammonium salts but no nitrate and part 
of their nitrogen in organic combination. All were complete fertilizers except 
Nos. 63902, 64026, and 64773, and these were, respectively, commercial nitrate 
of soda, commercial nitrate of lime, and pure bone meal. The total nitrogen 
content of the complete fertilizers varied from 0.91 per cent to 5.89 per cent 
and their organic nitrogen content from 0.47 per cent to 3.3 per cent. The 
object of selecting such samples was to find if the nitrogen of added nitrate 
could be recovered in their presence; if so, then this would afford a method for 
determining nitrate in the presence of ammonium salts and organic nitrogenous 
compounds. Moreover, it was thought that possibly the control determinations 
might also afford an accurate estimation of the ammoniacal nitrogen present. 
