Hanna Instruments HI 83216-01 User Manual

Page 22

Calcium Hardness

CALCIUM HARDNESS

SPECIFICATIONS

Range

0 to 500 mg/L (as CaCO

)

Resolution

5 mg/L

Accuracy

±10 mg/L ±5% of reading at 25 °C

Typical EMC

±5 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 34.

MEASUREMENT PROCEDURE

• Select the

Calcium Hardness method using the procedure

described in the

Method Selection section (see page 15).

• Rinse a graduated beaker several times with deionized

water, fill a 1 mL syringe with the sample, and inject
0.5 mL into the beaker. Fill the beaker up to the 50 mL
mark with hardness-free water.

• 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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