Hanna Instruments HI 83099 - Manual (Page 36)

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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 3+ above 0.25 mg/L
Chromium 6+ 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.