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Oxygen Demand, Chemical
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.
HRS MIN SEC
HRS MIN SEC
9.
Heat the vials for two
hours.
Oxygen Demand, Chemical
Page 2 of 8
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.
HRS MIN SEC
HRS MIN SEC
10.
Turn the reactor off.
Wait about 20 minutes for
the vials to cool to 120 °C
or less.
7.
Cap the vials tightly.
Rinse them with
deionized water and
wipe with a clean paper
towel.
11.
Invert each vial
several times while still
warm. Place the vials into
a rack and cool to room
temperature.
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.
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12.
Proceed to the
Colorimetric Determination
Method 8000 on page 3.
OxygenCOD_None_Mid_RCD_Eng_Ody.fm
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