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PROCEDURE
1. Press and hold
ENTER
2. Press
to select Testing Menu.
3. Scroll to and select All Tests (or another sequence containing 008 Ammonia-N
HR) from Testing Menu.
4. Scroll to and select 008 Ammonia-N HR from menu.
5. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with
sample.
6. Insert tube into chamber, close lid and select Scan Blank. (See Note)
7.
Remove tube from colorimeter. Add 8 drops of Ammonia Nitrogen Reagent #1 (V-
4797). Cap and mix. Wait 1 minute.
8. Use the 1.0 mL pipet (0354) to add 1.0 mL of *Ammonia Nitrogen Reagent #2 (V-
4798). Cap and mix. Allow 5 minutes for maximum color development.
9. At end of the 5 minute waiting period, immediately mix, insert tube into chamber,
close lid and select Scan Sample. Record result.
10. Press
to turn the colorimeter off or press the
menu or make another menu selection.
CALCULATIONS:
To express results as Unionized Ammonia (NH
To express results as Ionized Ammonia (NH
To determine the percentages of Unionized and Ionized Ammonia-Nitrogen, consult
the Appendix.
NOTE: It is strongly suggested that a reagent blank be determined to account for
any contribution to the test result by the reagent system. To determine the reagent
blank, follow the above test procedure to scan a distilled or deionized water blank.
Then follow the above procedure to perform the test on a distilled or deionized water
sample. This test result is the reagent blank. Subtract the reagent blank from all
subsequent test results of unknown samples. It is necessary to determine the reagent
blank only when a new lot number of reagents is obtained.
COD3 Plus Colorimeter 10.16
until colorimeter turns on.
ppm Unionized Ammonia (NH
ppm Ammonia-Nitrogen (NH
4
ppm Ionized Ammonia (NH
ppm Ammonia-Nitrogen (NH
EXIT
):
3
) =
3
–N) x 1.2
3
):
+
) =
4
–N) x 1.3
3
Ammonia Nitrogen, High Range
exit to a previous
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