141
OXYGEN, DISSOLVED
8.44. OXYGEN, DISSOLVED
SPECIFICATIONS
Range 0.0 to 10.0 mg/L (as O
2
)
Resolution 0.1 mg/L
Accuracy ±0.4 mg/L ±3% of reading at 25 °C
Light Source LED with narrow band interference filter @ 420 nm
Method Adaptation of the Standard Methods for the Examination of Water and
Wastewater, 18th edition, Azide modified Winkler method.
REQUIRED REAGENTS
Code Description Quantity
HI93732A‑0 Dissolved Oxygen Reagent A 5 drops
HI93732B‑0 Dissolved Oxygen Reagent B 5 drops
HI93732C‑0 Dissolved Oxygen Reagent C 10 drops
REAGENT SET
HI93732‑01 Reagents for 100 tests
HI93732‑03 Reagents for 300 tests
For other accessories see page 200.
MEASUREMENT PROCEDURE
• Select the Oxygen (dissolved) method using the procedure
described in the Method Selection section (see page 18).
• Fill one 60 mL glass bottle completely with the unreacted
sample.
• Replace the cap and ensure that a small part of the sample
spills over.
• Remove the cap and add 5 drops of HI93732A‑0 and 5 drops of
HI93732B‑0.
• Add more sample, to fill the bottle completely. Replace the cap
and ensure that a part of the sample spills over.
Note: This ensures no air bubbles have been trapped inside
the bottle. Trapped air bubbles could alter readings.
• Invert the bottle several times until the sample turns orange‑
yellow and a flocculating agent appears.
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