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PROCEDURE
1. Press and hold
ENTER
2. Press
to select Testing Menu.
3. Select All Tests (or another sequence containing 085 Potassium) from Testing
Menu.
4. Scroll to and select 085 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 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.
10. Press
to turn colorimeter off or press
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
until colorimeter turns on.
EXIT
to exit to a previous menu or
COD3 Plus Colorimeter 10.16
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