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PROCEDURE
Use COD/UDV adapter.
1. Homogenize sample if necessary.
2. Preheat COD heater block to 150±2°C.
3. Remove cap from COD tube. Hold tube at a 45° angle. Use a volumetric pipet, to
carefully add 2.0 mL sample water allowing the sample to run down the side of the
tube.
4. Cap and mix thoroughly.
5. Rinse the outside of the vial with distilled water. Wipe dry with a paper towel.
6. Repeat steps 2 through 5 using 2.0 mL distilled water. This is the reagent
blank.
7.
Place tubes in preheated COD block heater and maintain temperature at 150±2°C
for two hours.
8. At the end of the heating period turn the heater off . Wait 20 minutes for the tubes
to cool to 120°C or less.
9. Remove tubes from block heater. Invert several times to mix.
10. Allow to cool to room temperature.
11. Press and hold
ENTER
12. Press
to select Testing Menu.
13. Select All Tests (or another sequence containing 032 COD SR) from Testing
Menu.
14. Wipe the blank tube with a damp towel to remove fi ngerprints and smudges. Wipe
with a dry towel.
15. Scroll to and select 032 COD SR from menu.
16. Insert reagent blank tube into chamber. Select Scan Blank.
17. Remove tube from colorimeter.
18. Insert digested water sample tube into chamber. Select Scan Sample. Record
result. For the most accurate results, take three readings on each sample and
average the results.
19. Press
to turn colorimeter off or press
make another menu selection.
NOTES: Reagents are light sensitive. Unused reagents should be stored in the shipping
container, and in the refrigerator if possible, until needed.
COD3 Plus Colorimeter 10.16
until colorimeter turns on.
EXIT
to exit to a previous menu or
COD, Standard Range
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