TM 5-6630-215-12
NOTE
The titrant reagent dropper should be held in a
verical manner, and the drops should be dispensed
at a rate not faster than one drop per second.
The dropper should be held slightly above the top
of the mixing bottle so that it never comes into
contact with the side of the mixing bottle.
Table 2-4 lists conversion factors for different
units of measure common to ours and other nations
use.
(2) Calcium Hardness Test - (0-500 mg/l range).
(a) Fill plastic measuring tube level full of test water and pour it into
the mixing bottle.
(b) Add 2 drops of 8N potassium hydroxide solution.
(c) Add the contents of one Calver II Calcium Indicator Powder
Pillow.
(d) Add titrant reagent hardness 3 dropwise (counting the num-
ber of drops) until the color changes from pink to blue.
Mix the
solution swirling after each drop addition.
(e) The calcium hardness in mg/l (as Calcium Carbonate, CaCO3)
is equal to 17.2 times the number of drops of titrant reagent hardness
3 added.
(3) Calcium Hardness Test - (500-9000 mg/l range).
(a) Dilute the test water by pipetting 1 ml (use lcc/l ml drop-
per) of the test water into a 25 ml graduated cylinder and invert
several times to mix.
(b) Fill the plastic measuring tube level full of diluted test
water and put it into the mixing bottle.
(c) Add 2 drops of 8N potassium hydroxide solution.
(d) Add the contents of one Calver II Calcium Indicator Powder
Pillow.
(e) Add titrant reagent hardness 3 dropwise (counting the num-
ber of drops) until the color changes from pink to blue.
Mix the
solution by swirling after each drop addition.
(f) The calcium hardness in mg/l (as Calcium Carbonate, CaCO3)
is equal to 430 times the number of drops of titrant reagent hardness
3 added.
2-74
