LaMotte HARDNESS TEST KIT 4824-DR-LT - Manual (Page 3)

CALCIUM HARDNESS TEST PROCEDURE
If the plunger reaches the bottom line on the scale
(200 ppm) before the endpoint color change occurs,
NOTE:
refill the Titrator and continue the titration.
When recording the test result, be sure to include the value of the
original amount of reagent dispensed (200 ppm).
MAGNESIUM HARDNESS TEST PROCEDURE
Subtract Calcium Hardness from Total Hardness. Record as ppm
Magnesium Hardness as CaCO .
3
Magnesium Hardness (ppm CaCO ) =
3
_
Total Hardness Calcium Hardness
Read the test
result directly
from the scale
where the large
ring on the
Titrator meets the
Titrator barrel.
Record as ppm
Total Hardness as
(CaCO ).
3
7.
EXAMPLE:
Plunger tip is
2 minor divisions
below line 80.
Test result is:
80 + (2 divisions x 4)
= 88 ppm.
80
100
Result:
88 ppm
120
2.
5.
Fill
Direct Reading
Titrator (0382)
with Hardness
Reagent #7
(4487DR).
Insert the
Titrator into
the center
hole of the
test tube cap.
1. 3.
4.
tube, slowly press
the plunger to
titrate until the
red color changes
to clear blue.
Add 6 drops
of *Sodium
Hydroxide
w/Metal
Inhibitor
(4259). Cap
and swirl to
mix.
Add one
Calcium
Hardness Indicator
Tablet (T-5250).
Cap and swirl
until tablet
disintegrates.
Solution will turn
red.
Fill a test
tube (0608)
to the 12.9
mL line with
the sample
water.
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
While gently
swirling the
6.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0