93
Dissolved Oxygen
• Let the sample stand and the flocculent agent will start to settle.
• After approximately 2 minutes, when the upper half of the bottle becomes limpid, add
10 drops of HI 93732C-0.
• Replace the cap and invert the bottle until the settled flocculent dissolves completely.
The sample is ready for measurement when it is yellow and completely limpid.
• Fill the cuvette up to the mark with 10 mL of the unreacted
(original) sample, and replace the cap. This is the blank.
• 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.
• Remove the cuvette.
• Fill another cuvette up to the mark with 10 mL of the reacted
sample and replace the cap.
• Reinsert the cuvette into the instrument.
• Press
Read
to start the reading. The instrument will display the results in
mg/L of dissolved oxygen
.
10 mL
INTERFERENCES
Interferences may be caused by reducing and oxidizing materials.