Hanna Instruments c 99 Manuel D’Utilisation

67

Hardness Mg

SPECIFICATIONS

Range

0.00 to 2.00 mg/L

Resolution

0.01 mg/L

Accuracy

±0.11 mg/L ±5% of reading

Typical EMC

±0.02 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

EDTA colorimetric method. The reaction

between magnesium and reagents causes a red-

dish-violet tint in the sample.

REQUIRED REAGENTS

Code

Description

Quantity

HI  93719A-0

Mg indicator

0.5 mL

HI  93719B-0

Alkali solution

0.5 mL

HI  93719C-0

EDTA solution

1 drop

HI 93719D-0

EGTA solution

1 drop

REAGENT SETS

HI 93719-01 Reagents for 100 tests
HI 93719-03 Reagents for 300 tests
For other accessories see page 141.

MEASUREMENT PROCEDURE

• Select the program number corresponding to Hardness Mg on the

secondary LCD by pressing PROGRAM W and V.

• 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 93719A Magnesium

indicator solution, then swirl to mix.