LaMotte SMART3 Colorimeter - Manual (Page 270)

PROCEDURE
1. Press and hold until colorimeter turns on.
2. Press ENTER to select TESTING MENU.
3. Select ALL TESTS (or another sequence containing 083 Potassium) from
TESTING MENU.
4. Scroll to and select 083 Potassium from menu.
5. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with sample.
6. Insert tube into chamber, close lid and select SCAN BLANK.
7. Remove tube from colorimeter. Add 4 drops of *Sodium Hydroxide, 1.0N
(4004WT). Cap and mix.
8. Use the 0.05 g spoon (0696) to add one measure of *Tetraphenylboron Powder
(6364). Cap and shake vigorously until all of the powder has dissolved. Wait 5
minutes.
9. At end of 5 minute waiting period, mix tube again to suspend any settled
precipitate. Insert tube into chamber, close lid and select SCAN SAMPLE.
Record result.
10. Press to turn colorimeter off or press
EXIT
to exit to a previous menu or
make another menu selection.
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 SMART3 Test Procedures 2.11
Test P
rocedures