11
8. Use the 0.05 g spoon (0696) to add one measure of *Tetraphenylboron
Powder (6364). Cap and shake vigorously for 20 seconds 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 as ppm potassium.
10. Press
to turn colorimeter off or press
EXIT
to exit to a previous
menu or make another menu selection.
NOTE: ppm = mg/L
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.
For the most accurate results, the sample and reagents should be at 25±4°C.
NOTE: If a test result using the SMART3 Colorimeter gives an over range
message then the the sample must be diluted. The test should be repeated on
the diluted sample to obtain a reading which is in the concentration range for
the test. See page 26.
