LaMotte SMART 2 - Manual (Page 196)

PROCEDURE
þ NOTE: Place Dispenser Cap (0692) on *Mixed Acid Reagent (V-6278). Save
this cap for refill reagents.
1. Press and hold ON button until colorimeter turns on.
2. Press ENTER to start.
3. Press ENTER to select TESTING MENU.
4. Select ALL TESTS (or another sequence containing 67 Nitrite-N
LR
) from TESTING MENU.
5. Scroll to and select 67 Nitrite-N LR from menu.
6. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with
sample.
7. Insert tube into chamber, close lid and select SCAN BLANK.
8. Remove tube from colorimeter and pour off 5 mL into a graduated
cylinder or similar. Discard the remaining sample.
9. Pour the 5 mL sample from the graduated cylinder into the colorimeter
tube. Use graduated cylinder or similar to measure 5 mL of *Mixed Acid
Reagent (V-6278) and add to tube. Cap and mix.
10. Use the 0.1 g spoon (0699) to add two measures of *Color Developing
Reagent (V-6281). Cap and mix by gently inverting for 1 minute. Wait 5
minutes for maximum color development.
11. At the end of the 5 minute waiting period, mix, insert tube into chamber,
close lid and select SCAN SAMPLE. Record result.
12. Press
OFF button to turn colorimeter off or press EXIT button to exit to a
previous menu or make another menu selection.
þ NOTE: To convert nitrite-nitrogen (NO
2
–N) results to ppm nitrite (NO
2
),
multiply results by 3.3.
Nitrite-Nitrogen–LR 2/2 Smart2 TEST PROCEDURES 2.04