Hanna Instruments HI 83099 User Manual

Page 36

Magnesium

SPECIFICATIONS

Range

0 to 150 mg/L

Resolution

5 mg/L

Accuracy

±5 mg/L ±3% of reading at 25 °C

Light Source

Tungsten lamp with narrow band interference filter @ 466 nm

Method

Adaptation of the Calmagite method

REQUIRED REAGENTS

Code

Description

Quantity

HI 93752

A-0 Mg Magnesium Buffer Reagent 1 mL

HI 93752

B-0 Mg Magnesium Indicator Reagent 9 mL

REAGENT SETS

HI 937520-01

Reagents for 50 tests

HI 937520-03

Reagents for 150 tests

For other accessories see page 132.

MEASUREMENT PROCEDURE

Note: for sample preparation follow the COLORED OR TURBID SAMPLES

procedure on page 17.

• Select the

Magnesium method using the procedure described in the

Method Selection section (see page 12).

• Using one 1 mL syringe add exactly 1.00 mL of HI 93752A-0

Mg Buffer reagent to the cuvette and use the pipette to fill the
cuvette up to the 10 mL mark with the HI 93752B-0 Mg
Indicator reagent.

• Replace the cap and invert several times to mix.

• Place the cuvette into the holder and close the lid.

• Press the

Zero key. The display will show “-0.0-” when the meter is zeroed and ready for

measurement.

MAGNESIUM

Iron LR

INTERFERENCES

Interference may be caused by:

Cadmium above 4.0 mg/L

Chromium

above 0.25 mg/L

Chromium

above 1.2 mg/L

Cobalt above 0.05 mg/L

Copper above 0.6 mg/L

Cyanide above 2.8 mg/L

Manganese above 50.0 mg/L

Mercury above 0.4 mg/L

Molybdenum above 4.0 mg/L

Nickel above 1.0 mg/L

Nitrite ion above 0.8 mg/L

Sample pH should be between 3 and 4 to avoid developed color to fade or turbidity formation.