LaMotte SMART3 Soil Operator's Manual page 100

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 068 Nitrite-N LR) from Testing
4. Scroll to and select 068 Nitrite-N LR from menu.
5. Use the 1 mL pipet (0354) to add 2 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 5 mL diluted extract from the graduated cylinder into the colorimeter
9. Use the 0.1 g spoon (0699) to add two measures of *Color Developing Reagent (V-
10. At the end of the 5 minute waiting period, mix, insert tube into chamber, close lid
11. Press
NOTE: To convert nitrite-nitrogen (NO
by 3.3.
NITRITE-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 a
graduated cylinder or similar. Discard the remaining diluted extract.
tube. Use graduated cylinder or similar to measure 5 mL of *Mixed Acid Reagent
(V-6278) and add to tube. Cap and mix.
6281). Cap and mix by gently inverting for 1 minute. Wait 5 minutes for maximum
color development.
and select Scan Sample. Multiply the result by 50 to determine the nitrite-nitrogen
concentration in lb/acre.
to turn colorimeter off or press
menu or make another menu selection.
Nitrite-Nitrogen Concentration Chart
Pounds Per Acre
0.0-2.0 lb/acre
2.5-4.0 lb/acre
4.5-10.0 lb/acre
Over 10 lb/acre
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15
10 20
5 25
0 30
EXIT button to exit to a previous
–N) results to ppm nitrite (NO
2
Range
Low
Medium
Medium High
High
Smart3 Soil Test Procedures 9.18
– ), multiply results
2
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