330 
Journal of Agricultural Research 
Vol. XXV, No. r 
Table I. —Comparison between carbonic method and the hydrochloric and iodin methods 
recommended by Averitt for determining soluble sulphur found in sample of dry lime- 
sulphur 
Form of sulphur determined. 
Methods recommended by 
Averitt. 
Carbonic 
method A. 
Hydrochloric, 
Iodin. 
i. Monosulphid 1 . 
Per cent . 
13- 21 
I. 56 
50. 84 
Per cent. 
II. 25 
I. 40 
48.03 
Per cent . 
8.86 
1. 80 
51.02- 
a. Thiosulphate. 
3 . Residual. 
Total. 
6$. 61 
60. 68 
61. 68, 
1 The differences in the determination erf monosulphid sulphur as shown in this table are very marked, 
and similar variations were observed when the methods were applied to other samples. 
Table II. —Results obtained by use of the carbonic method A 
Experiment No. 
Dry 
lime- 
sulphur. 
Length of 
time of 
experi¬ 
ment. 
Residual 
sulphur. 
Thio¬ 
sulphate 
sulphur. 
Mono¬ 
sulphid 
sulphur. 
Absorption solution. 
Gnu 
Hours . 
Per cent. 
Per cent. 
Per cent. 
0. as 
r'A 
50.64 
a- 75 
8.32 
NasOs. 
•as 
iH 
50.60 
a* 73 
8-35 
Do. 
• *5 
1M 
50.68 
2. 75 
8-33 
Do. 
•as 
1 H 
50-64 
a- 75 
8.40 
Do. 
•as 
1 H 
50.68 
2 .75 
8-34 
Do. 
Average. 
50-65 
2.7 5 
8.35 
•So 
aX 
51.00 
2.62 
8.41 
Do. 
•as 
I 
50.64 
3.01 
(a) 
Ammoniacal H2O3. 
g. 
* as 
2 
50.64 
3.01 
Do. 
• So 
2 
50.64 
2.56 
Do. 
IQ r fTf . t .. t . t _ 
•So 
2 
50.64 
2.56 
Do. 
Average. 
50.64 
2.79 
ii. ... 
1.00 
s l A 
50.55 
2.58 
Do. 
• *5 
17 K 
50.76 
2 * 73 
Do. 
Average. 
50.66 
2.66 
a Monosulphid sulphur was not determined for the reason that the HjOj solution used was later foundt o 
contain sulphate. 
Table III. —Results obtained by use of the carbonic method A — Continued 
Experiment No. 
Dry lime- 
sulphur. 
Length 
of time 
of experi¬ 
ment. 
Residual 
sulphur. 
Thio¬ 
sulphate 
sulphur. 
Mono¬ 
sulphid 
sulphur. 
Absorption solution. 
I. 
Gnt , 
o-5 
•5 
Hours. 
c 
Per cent. 
50.63 
50.64 
50.60 
Per cent. 
2. 64 
2. 6l 
Per cent. 
8. AO 
3.6 normal NaOH. 
0 
c 
f- 35 
8-35 
4.7 normal NaOH. 
NH 4 OH. 
2... 
D 
C 
2. 58 
• D 
0 
Average. 
50. 62 
2 . 6l 
8-37 
A. 
4 
S°- 56 
50. 60 
2. 68 
\ 
f a 7- 9 1 
8. 46 
f a 8 . 33 
l 6 8 . 32 
jweak standard I 2 - 
• D 
. C 
T 
3X 
3.00 
1 
\ 
jweak standard I 2 . 
1 
a By titration with standard NatStOs solution. 
& By weight of precipitated sulphur. 
