LaMotte SMART Spectro Spectrophotometer - Manual (Page 151)

PROCEDURE
Use universal sample holder
1. Press and hold
ON button until spectrophotometer turns on.
2. Scroll to and select PROGRAMMED TESTS.
3. Select ALL TESTS (or another sequence containing 48 H Per
Shock
) from TESTING MENU.
4. Scroll to and select 48 H Per Shock from menu.
5. Use the pipet (0342) to add 5 drops of the sample water to a tube (0290).
6. Dilute to the 10 mL line with distilled or hydrogen peroxide-free water.
7. Insert the tube into chamber, close lid and select SCAN BLANK.
8. Remove the tube from spectrophotometer and add 4 drops of *Hydrogen
Peroxide Reagent #1 (6452). Cap and mix.
9. Add one *Hydrogen Peroxide LR Tablet (6454). Crush tablet with Tablet
Crusher (0175). Cap and mix for 30 seconds. Solution will turn pink if
hydrogen peroxide is present. Wait 5 minutes for full color development.
10. At the end of 5 minute waiting period, mix, insert tube into chamber, close
lid and select SCAN SAMPLE. Record result.
11. Press
OFF button to turn the spectrophotometer off or press EXIT button
to exit to a previous menu or make another menu selection.
þNOTES: For best possible results, a 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.
Hydrogen Peroxide–Shock 2/2 SMART SPECTRO TEST PROCEDURES 04.08