LaMotte SMART3 Colorimeter - Manual (Page 228)

other Total Nitrogen Acid Reagent Tube. This is the sample.
22. Cap the tubes and invert 10 times to mix.
CAUTION: The tubes will be hot.
Note: Invert slowly and completely for accurate results. Hold tubes with caps up.
Invert the tube and wait for the air bubble to fl ow to the bottom of the tube. Turn
the tube upright and wait for the air bubble to return to the top of the tube. This
is one inversion.
23. Wait 5 minutes.
24. Wipe the tubes with a damp towel to remove fi ngerprints and smudges. Wipe
with a dry towel.
25. Insert the blank tube into the chamber. Select SCAN BLANK. Remove the blank
tube from the colorimeter.
26. Insert the sample tube into the chamber. Select SCAN SAMPLE. Record the
result as Total Nitrogen in mg/L N.
27. Press to turn the colorimeter off or press
EXIT
to exit to a previous menu
or make another menu selection.
NOTES: For greater accuracy, use laboratory grade pipets.
To order reagent refi lls, Order Code R-4026.
NITROGEN, Total SMART3 Test Procedures 2.11
Test P
rocedures