HILLEBKANO.] 
VANADIUM (CHROMIUM) AND MOLYBDENUM. 
87 
Table II. 
Showing application of correction for larger amounts of chromium, obtained by adding 
potassium permanganate to an equal bulk of solution containing a lih amount of chro- 
mic sulphate. 
x... 
Chromic 
oxide. 
Vanadium 
pentoxide. 
Vanadium 
pentoxide 
found. 
Vanadium 
pentoxide 
found. 
Error. 
Volume of solu- 
tion. 
Milligrams. 
Milligrams. 
Uncorrected. 
< 'urn ii< <l . 
Milligram.' 
in 
20 
0.94 
1.59 
0. 99 
+0. 05 
50-100 cm. 3 
17 
20 
1.S7 
2.69 
2.8!) 
2. 59 
2. 09 
1.79 
1.99 
+ .22 
- .08 
+ .12 
50-100 cm. 3 
IS 
20 
IS. 74 
19.4 
19. 3 
19.3 
18. 73 
18.63 
18.63 
- .01 
- .11 
- .11 
50-100 cm. 3 
1!) 
30 
1.87 
2.99 
2.79 
2. 79 
2.69 
2.69 
2.14 
1.94 
1.94 
1.84 
1.84 
+ .27 
+ .07 
+ .07 
- .03 
- .03 
About 1(10 cm. 3 
20 
30 
1.S7 
2. 69 
2.89 
2.89 
2.79 
1.79 
2. 09 
2.09 
1.99 
- .08 
+ .22 
+ .22 
+ .12 
200 (•lii/' 
21 
62 
46. 85 
48.60 
47.60 
+ .75 
200 cin.'' 
Iii spite of the faet that the correction in most of the trials of this 
last table represents a large proportion of the permanganate used, the 
results must be considered satisfactory in view of the small amount of 
vanadium present, and they show that the method in competent hands 
after a little experience affords trustworthy figures. 
The method of T. Fischer 1 — digestion of the precipitated lead salts 
with a strong solution of potassium carbonate — appears to offer the 
long-needed satisfactory quantitative separation of arsenic, phos- 
phorus, chromium, tungsten, and molybdenum from vanadium, the 
normal lead meta-vanadate remaining quite unattacked, according to 
the author, while the other lead salts are wholly decomposed, but 1 In- 
applicability of this method to the separation of the minute amounts 
often found in rocks and ores has not been tested. The object has 
been in the present case to reach satisfactory results with the great- 
est expedition, and when chromium is not present in considerable 
amount this is accomplished. 
Fortunately, chromium is almost never a prominent constituent of 
Inaugural Dissertation, Kostock, 1S ( J1. 
