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OXYGEN DEMAND, CHEMICAL,
13.
Close the vacuum
regulator valve
completely to achieve
full vacuum. After one
minute under full
vacuum, slide the VPD
back and forth several
times to dislodge any
drops clinging to the
cartridge.
14.
Open the VPD
regulator valve to
release the vacuum.
Turn the pump off.
Remove the VPD top
and set it beside the
base.
continued
15.
Use forceps to
remove the filter from
the top of each CRC.
Place each filter in the
corresponding Mn III
COD Vial (use the
numbers on the VPD as
a guide).
Note: If the sample does
not contain suspended
solids, it is not necessary to
transfer the filter to the
digestion vial.
Note: To avoid cross
contamination, clean
forceps tips between
samples by wiping with a
clean towel or rinsing with
deionized water.
318
16.
Remove the Mn III
COD vial from the
vacuum chamber and
replace the original cap.
Screw the cap on tightly.
Invert several times to
mix.
Note: Dispose of the used
Chloride Removal
Cartridge. Do not reuse it.
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