19S 
BROMINE IN MINERAL WATERS. 
measured in a vessel capable of containing 25 grms. of 
water ; and the same quantities of ether and chlorine water 
were added to them as to to the test-liquid. The operation 
requires to be made with great haste, because after some 
time the colour of the ether decreases, and entirely disap- 
pears in the course of 12 to 16 hours. 
The following are the results of several experiments : — 
Corresponded The ley consequently 
to a test-liquor contains 
No. Spec. grav. Mother-ley. Salt-works, containing ( A ^ 
Grms. 
bromide of 
potassium, 
.vlilligrms. 
Bromide D 
Bromine 
potassium 
In 100 parts. 
1. 
1.255 
31.375 
Halle 
41 
0.131 
0.087 
2. 
1.270 
31.750 
Kosen 
36 
0.113 
0.075 
3. 
1.315 
32.875 
35* 
0.107 
0.071 
4. 
1.303 
32.575 
Artern 
32 
0.098 
0.065 
5. 
1.250 
31.250 
Schonebeck29 
0.093 
0.062 
6. 
1.273 
31.825 
33 
0.104 
0.069 
In such cases as the above, in which the amount of bro- 
mine is by no means considerable, the method proposed for 
ascertaining its amount by means of a scale of colours ap- 
pears to me more certain than the analytical determination 
from the mixture of chloride and bromide of silver accord- 
ing to Rose. The numbers obtained for the bromine should 
properly be subtracted from the amounts of chlorine ; but 
they are not sufficiently large to render a re-calculation of 
the results of the analysis of the leys necessary. 
Quite as accurately, if not more so, may iodine be esti- 
mated in liquids by the well known method with solution 
of starch and nitric acid. A large amount of chlorine 
(which is the case in the brines and leys from salt works) 
is, it is true, a hindrance; I have however convinced 
myself, by the addition of-^ 1 ^ iodide of potassium, that the 
*Ths s ample on shaking, yielded a froth which floated in the layer of 
ether, and somewhat jorevented the comparison of the colour ; however, the 
error cannot be very considerable. 
