LaMotte SMART 2 - Manual (Page 162)

PROCEDURE
1. Press and hold ON until colorimeter turns on.
2. Press
ENTER to start.
3. Press
ENTER to select TESTING MENU.
4. Select ALL TESTS (or another sequence containing 46 H
Peroxide-LR
) from TESTING MENU.
5. Scroll to and select 46 H Peroxide-LR from menu.
6. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with
sample
7. Insert tube into chamber, close lid and select SCAN BLANK. (See Note)
8. Remove tube from Colorimeter and add 4 drops of *Hydrogen Peroxide
Reagent #1 (6452). Cap and mix.
9. Add one *Hydrogen Peroxide LR Tablet (6454A). 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 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 off or press EXIT button to exit to a previous
menu or make another menu selection.
þ 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 is obtained.
For the most accurate results, the sample and reagents should be at 25 ±4 ºC.
Hydrogen Peroxide–LR 2/2 Smart2 TEST PROCEDURES 1.11