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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,

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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Hanna Instruments HI 83099 User Manual

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