Oxygen Demand, Chemical
Oxygen Demand, Chemical
Page 2 of 8
OxygenCOD_None_Mid_RCD_Eng_Ody.fm
5. Hold one vial at a
45-degree angle. Use a
clean volumetric pipet to
add 2.00 mL of sample to
the vial. This is the
prepared sample.
Note: Use a TenSette pipet to
add 0.20 mL for the 200–
15,000 mg/L range.
6. Hold a second vial at
a 45-degree angle. Use a
clean volumetric pipet to
add 2.00 mL of deionized
water to the vial. This is
the blank.
Note: Use a TenSette pipet to
add 0.20 mL for the 200–
15,000 mg/L range.
7. Cap the vials tightly.
Rinse them with
deionized water and
wipe with a clean paper
towel.
8. Hold the vials by the
cap over a sink. Invert
gently several times to
mix. Place the vials in the
preheated COD Reactor.
The sample vials will
become very hot during
mixing.
9. Heat the vials for two
hours.
10. Turn the reactor off.
Wait about 20 minutes for
the vials to cool to 120 °C
or less.
11. Invert each vial
several times while still
warm. Place the vials into
a rack and cool to room
temperature.
12. Proceed to the
Colorimetric Determination
Method 8000 on page 3.
HRS MIN SECHRS MIN SEC
HRS MIN SECHRS MIN SEC
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