8
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 as ppm
ammonia nitrogen.
10. Press
to turn the colorimeter off or press the
EXIT
exit to a previous
menu or make another menu selection.
NOTE: ppm = mg/L
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.
NOTE: If a test result using the SMART3 Colorimeter gives an over range
message then the the sample must be diluted. The test should be repeated on
the diluted sample to obtain a reading which is in the concentration range for
the test. See page 26.
