21
METHOD PROCEDURE
• Replace the cap and invert the bottle until the settled
flocculating agent dissolves completely. The sample
is ready for measurement when it is yellow and
completely clear.
• Fill the first cuvette (#1) with 10 mL of the unreacted
sample (up to the mark). Replace the plastic stopper
and the cap.
• 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.
• Remove the cuvette.
• Fill second cuvette (#2) with 10 mL of the reacted
sample (up to the mark). Replace the plastic stopper
and the cap.
• Insert the cuvette into the holder and ensure that the
notch on the cap is positioned securely in the groove.
• Press
Read
to start the reading. The instrument will display the results in
mg/L
of
oxygen (O
2
).
INTERFERENCES
Interference may be caused by:
• Reducing and oxidizing materials
#1
10 mL
#1
#2
#2