LaMotte Dissolved Oxygen Water Quality - Manual (Page 8)

TEST PROCEDURE
6
9.
6.
Continue
titrating until
the blue color
disappears and
the solution
becomes
colorless.
Carefully remove the
Titrator and cap. Do
not to disturb the
Titrator plunger.
Add 8 drops of
Starch Indicator
Solution
(4170WT). The
sample should
turn blue.
8.
11. 10.
Cap the titration
tube. Insert the tip of
the Titrator into the
opening of the
titration tube cap.
Insert the tip of the
Titrator into the
opening of the
titration tube cap.
Slowly depress the
plunger to dispense the
titrating solution until
the yellow-brown
color changes to a very
pale yellow. Gently
swirl the tube during
the tiration to mix the
contents.
7.
12.
Read the test result directly
from the scale where the large
ring on the Titrator meets the
Titrator barrel. Record as ppm
Dissolved Oxygen. Each
minor division on the Titrator
scale equals 0.2 ppm.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
4.0
5.0
Result:
4.0 ppm