Test Procedures
PROCEDURE
Use universal sample holder.
1. Press
ON
button to turn spectrophotometer on.
2. Scroll to and select
PROGRAMMED TESTS
.
3. Scroll to and select
ALL TESTS
(or another sequence containing
81 Potassium
) from
TESTING MENU
.
4. Scroll to and select
81 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 Spectro. 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.
Immediately insert tube into chamber, close lid and select
SCAN SAMPLE
. Record
result.
10. Press and hold
OFF
button to turn spectrophotometer off or press
EXIT
button 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 is obtained.
For the most accurate results, the sample and reagents should be at 25±4°C.
POTASSIUM
SMART Spectro 2 Test Procedures 05.02.16
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