118
• Add some more sample, to fill the bottle completely. Replace the
cap again and ensure that a part of the sample spills over. This
is to make sure that no air bubbles have been trapped inside,
which would corrupt the reading.
• Invert several times the bottle. The
sample becomes orange-yellow and
a flocculant agent will appear.
• Let the sample stand and the flocculant agent
will start to settle.
• After approximately 2 minutes, when the upper
half of the bottle becomes limpid, add 10 drops
of HI 93732C.
• Replace the cap and invert the bottle until dissolution of the
settled flocculant is complete. The sample is ready for measure-
ment when it is yellow and completely limpid.
• Fill the cuvet up to the mark with 10 mL of the
unreacted (original) sample, and replace the
cap. This is the blank.
• Place the cuvet into the holder and
ensure that the notch on the cap is
positioned securely into the groove.
• Press ZERO and “SIP” will blink on the display.
10 mL
x 10
Dissolved Oxygen
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