Hanna Instruments HI97105, Instruction Manual, Page: 23 / 40

23 Marine Ammonia
7.3. MARINE AMMONIA
REQUIRED REAGENTS
Code
Description Quantity
HI784A‑0 Marine Ammonia Reagent A 1 mL
HI784B‑0 Marine Ammonia Reagent B 1 packet
HI784C‑0 Marine Ammonia Reagent C 1 packet
REAGENT SETS
HI784‑25 Marine Ammonia Reagents 25 tests
For other accessories see Accessories section.
SAMPLING PROCEDURE
Prepared sample cuvette (sample plus reagents) must be 18 to 29 °C (65 to 85 °F).
Warm or cool prepared cuvettes if needed.
MEASUREMENT PROCEDURE
Select the Ammonia 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.
• Use a 1 mL syringe to dispense 1 mL of HI784A‑0 reagent into a clean, dry
cuvette.
Caution : HI784A-0 is corrosive! Dispense liquid slowly and avoid contact with
skin and eyes!
• Using scissors, open one packet of HI784B‑0 Reagent B along the dotted
line. Push the two corners together to make a spout. Add the content of the
packet to the cuvette.
• Use a pipette to fill the cuvette to the 10 mL mark with unreacted sample.
• Replace the plastic stopper and the cap. Shake gently until the powder is
completely dissolved (60‑90 seconds).
Do NOT shake vigorously – this will cause more air bubbles!
For the most accurate reading, ensure all reagent is dissolved and there are
no visible bubbles. Ensure the outside of the cuvette is dry and clean.
• Let the cuvette stand for 30 seconds. This allows complete dissipation of micro‑bubbles.
• Insert the cuvette into the holder and ensure that the notch on the cap is positioned securely in the groove.
(NH
3
/ NH
4
+
)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
1 mL
10 mL