LaMotte SMART3 Soil Operator's Manual page 106

PROCEDURE
1. Press and hold
2. Press
3. Select All Tests (or another sequence containing 085 Potassium) from Testing
4. Scroll to and select 085 Potassium 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. Use the 0.05 g spoon (0696) to add one measure of *Tetraphenylboron
9. At end of 5 minute waiting period, mix tube again to suspend any settled
10. Press
NOTES: 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.
For the most accurate results, the sample and reagents should be at 25±4°C.
POTASSIUM
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. Add 4 drops of *Sodium Hydroxide, 1.0N (4004WT).
Cap and mix.
Powder (6364). Cap and shake vigorously for 20 seconds until all of the
powder has dissolved. Wait 5 minutes.
precipitate. Insert tube into chamber, close lid and select Scan Sample. Multiply
the result by 50 to determine the potassium concentration in lb/acre.
to turn colorimeter off or press
make another menu selection.
Potassium Concentration Chart
Pounds Per Acre
0-44 lb/acre
50-76 lb/acre
82-143 lb/acre
144-281 lb/acre
Over 294 lb/acre
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15
10 20
5 25
0 30
EXIT to exit to a previous menu or
Range
Very Low
Low
Medium
High
Very High
Smart3 Soil Test Procedures 9.18
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