Hanna Instruments HI97105, Instruction Manual, Page: 27 / 40

27 Marine Magnesium
7.5. MARINE MAGNESIUM
REQUIRED REAGENTS
Code
Description Quantity
HI783A‑0 Marine Magnesium Reagent A 4 mL
HI783IND‑0 Marine Magnesium Indicator Reagent 1 packet
REAGENT SETS
HI783‑25 Marine Magnesium Reagents 25 tests
For other accessories see Accessories section.
SAMPLING PROCEDURE
Prepared sample cuvette (sample plus reagents) must be 22 to 28 °C (72 to 82 °F).
Warm or cool prepared cuvettes if needed. Temperature affects accuracy. Handle cuvette by cap to avoid
transferring heat from hands through the glass.
MEASUREMENT PROCEDURE
Select the Magnesium Marine method using the procedure described in Method Selection section.
Note : If tutorial mode is disabled, follow the measurement procedure below.
If the tutorial mode is enabled, press Measure and follow the messages on the screen.
Ensure cuvettes, syringes, and tips are completely clean and dry before use.
• Place the syringe tips onto each syringe. Ensure the O‑rings remain in the tip for a proper seal.
• Use the 5 mL syringe with black printing to measure 4 mL of
HI783A‑0 reagent.
Ensure there is no excess reagent on the syringe tip, then slowly dispense the
4 mL of reagent into a clean, dry cuvette. If excessive reagent remains in the tip,
draw a small amount of air into the syringe and use it to expel the remaining
reagent into the cuvette.
• Use the 5 mL syringe with blue printing to measure 5 mL of unreacted sample.
Ensure there is no excess sample on the syringe tip, then slowly dispense the
sample into the same cuvette. Ensure no sample is remaining in the tip.
Note : The total liquid volume will be below the 10 mL mark at this step.
• Replace the plastic stopper and the cap. Gently invert the cuvette 5 times until the solution
has been thoroughly mixed. Ensure there are no bubbles in the mixture and that the outside
of the cuvette is dry and clean.
• Insert the cuvette into the holder and ensure that the notch on the cap is positioned securely
in the groove.
• Press Zero . The display will show “‑0.0‑” when the meter is zeroed and ready for measurement.
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4 mL
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5 mL
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