94
8.26. HARDNESS, MAGNESIUM
SPECIFICATIONS
Range
0.00 to 2.00 mg/L (CaCO
3
)
Resolution
0.01 mg/L
Accuracy
±0.11 mg/L ±5% of reading at 25 °C
Light Source
LED with narrow band interference filter @ 525 nm
Method
Adaptation of the Standard Methods for the Examination of Water and
Wastewater, 18th edition, EDTA Colorimetric method.
REQUIRED REAGENTS
Code
Description Quantity
HI93719A‑0
Magnesium Hardness Reagent A
0.5 mL
HI93719B‑0
Magnesium Hardness Reagent B
0.5 mL
HI93719C‑0
Magnesium Hardness Reagent C
1 drop
HI93719D‑0
Magnesium Hardness Reagent D
1 drop
REAGENT SETS
HI93719‑01
Reagents for 100 tests
HI93719‑03
Reagents for 300 tests
For other accessories see page 200.
MEASUREMENT PROCEDURE
• Select the
Hardness (Magnesium)
method using the procedure
described in the Method Selection section (see page 18).
• 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
HI93719A‑0
Magnesium Hardness Reagent A, then
swirl to mix.
• Add 0.5 mL of
HI93719B‑0
Magnesium Hardness Reagent B and
swirl to mix. Use this solution to rinse 2 cuvettes.
HARDNESS
, MAGNESIUM
