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
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