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MAGNESIUM HARDNESS
MAGNESIUM HARDNESS
MAGNESIUM HARDNESS
MAGNESIUM HARDNESS
MAGNESIUM HARDNESS
Hardness Mg
SPECIFICATIONS
Range
0.00 to 2.00 mg/L
Resolution
0.01 mg/L
Accuracy
±0.11 mg/L ±5% of reading
Typical EMC
±0.02 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference
filter @ 525 nm
Method
Adaptation of the
Standard Methods for the
Examination of Water and Wastewater, 18
th
edition,
EDTA colorimetric method. The reaction
between magnesium and reagents causes a red-
dish-violet tint in the sample.
REQUIRED REAGENTS
Code
Description
Quantity
HI 93719
A
-0
Mg indicator
0.5 mL
HI 93719
B
-0
Alkali solution
0.5 mL
HI 93719
C
-0
EDTA solution
1 drop
HI 93719
D
-0
EGTA solution
1 drop
REAGENT SETS
HI 93719-01
Reagents for 100 tests
HI 93719-03
Reagents for 300 tests
For other accessories see page 141.
MEASUREMENT PROCEDURE
• Select the program number corresponding to Hardness Mg on the
secondary LCD by pressing PROGRAM
W
and
V
.
• Rinse a graduated beaker several times
with unreacted sample, before filling it
to the 50 mL mark with the sample.
• Add 0.5 mL of HI 93719A Magnesium
indicator solution, then swirl to mix.