56
Hardness Ca
CALCIUM HARDNESS
SPECIFICATIONS
Range 0.00 to 2.70 mg/L
Resolution 0.01 mg/L
Accuracy ±0.11 mg/L ±5% of reading at 25 °C
Typical EMC ±0.01 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,
Calmagite method. The reaction between calcium and reagents causes a
reddish-violet tint in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93720A-0 Ca & Mg indicator 0.5 mL
HI 93720B-0 Alkali solution 0.5 mL
HI 93720C-0 EGTA solution 1 drop
REAGENT SETS
HI 93720-01 Reagents for 100 tests
HI 93720-03 Reagents for 300 tests
For other accessories see page 132.
MEASUREMENT PROCEDURE
• Select the
Calcium Hardness
method using the procedure
described in the
Method Selection
section (see page 12).
• 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 93720A-0 Calcium indicator solution
and swirl to mix.
• Add 0.5 mL of HI 93720B-0 Alkali solution and swirl to
mix. Use this solution to rinse 2 cuvettes before filling
them up to the 10 mL mark.
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