LaMotte SMART3 Colorimeter - Manual (Page 214)

PROCEDURE
1. Press and hold until colorimeter turns on.
2. Press ENTER to select TESTING MENU.
3. Select ALL TESTS (or another sequence containing 065 Nitrate-TT) from
TESTING MENU.
4. Scroll to and select 065 Nitrate-TT from menu.
5. Rinse a tube (0290) with sample water. Fill to 10 mL line with sample.
6. Insert the tube into chamber, close lid and select SCAN BLANK.
7. Remove the tube from colorimeter.
8. Add one *Nitrate Spectrophotometric Grade Tablet (3881A-H).
9. Use Tablet Crusher (0175) to crush tablet.
10. Cap tube.
11. Invert tube 60 times per minute for 2 minutes (one inversion equals 180°).
12. Wait 5 minutes. Do not mix.
13. Insert tube into chamber, close lid and select SCAN SAMPLE. Record result in
ppm nitrate.
15. Press to turn the colorimeter off or press
EXIT
button to exit to a
previous menu or make another menu selection.
NOTE: For best possible results, a reagent blank should 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.
To convert nitrate (NO
3
) results to nitrate-nitrogen (NO
3
-N), divide by 4.4.
NITRATE, Tablet SMART3 Test Procedures 2.11
Test P
rocedures