LaMotte SMART3 Soil Operator's Manual page 97

PROCEDURE
NOTE: Place Dispenser Cap (0692) on *Mixed Acid Reagent (V-6278). Save this cap for
refi ll reagents.
1. Press and hold
2. Press
3. Select All Tests (or another sequence containing 065 Nitrate-N LR) from Testing
4. Scroll to and select 065 Nitrate-N LR from menu.
5. Use the 1 mL pipet (0354) to add 1 mL of soil extract to a clean tube (0290) and
6. Insert tube into chamber, close lid and select Scan Blank.
7.
8. Pour the 5mL diluted extract from a graduated cylinder or similar into the tube. Use
9. Use the 0.1 g spoon (0699) to add two measures of *Nitrate Reducing Reagent (V-
10. Hold tube by index fi nger and thumb and mix by inverting approximately 60 times a
11. At the end of the 10 minute waiting period, mix, insert tube into chamber, close
12. Press
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. It is necessary to determine the reagent blank only
when a new lot number of reagents are obtained.
To convert Nitrate Nitrogen (NO
NITRATE-NITROGEN
1.800.544.2843
until colorimeter turns on.
ENTER
to select Testing Menu.
Menu.
dilute to the 10 mL line with deionized water. Cap tube and mix.
Remove tube from colorimeter and pour off 5 mL of the diluted extract into
graduated cylinder or similar. Discard the remaining diluted extract.
the graduated cylinder or similar to measure 5 mL of *Mixed Acid Reagent (V-6278)
and add to tube. Cap and mix. Wait 2 minutes.
6279). Cap.
minute for four minutes. Wait 10 minutes for maximum color development.
NOTE: At end of waiting period an undissolved portion of Nitrate Reducing Reagent
may remain in bottom of the tube without aff ecting results.
lid and select Scan Sample. Multiply the result by 100 to determine the nitrate-
nitrogen concentration in lb/acre.
to turn colorimeter off or press
make another menu selection.
–N) results to ppm Nitrate (NO
3
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15
10 20
5 25
0 30
EXIT to exit to a previous menu or
–
), multiply by 4.4.
3
Smart3 Soil Test Procedures 9.18
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