LaMotte SMART 2 - Manual (Page 164)

PROCEDURE
1. Press and hold
ON button until colorimeter turns on.
2. Press
ENTER to start.
3. Press
ENTER to select Testing Menu.
4. Select ALL TESTS (or another sequence containing 47 H Per-HR)
from TESTING MENU.
5. Scroll to and select 47 H Per-HR from menu.
6. Use the pipet (0342) to add 5 drops of the sample water to a tube (0290).
7. Dilute to the 10 mL line with distilled or hydrogen peroxide-free water.
8. Insert the tube into chamber, close lid and select SCAN BLANK.
9. Remove the tube from colorimeter and add 4 drops of *Hydrogen
Peroxide Reagent #1 (6452). Cap and mix.
10. 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.
11. At the end of 5 minute waiting period, mix, insert tube into chamber,
close lid and select SCAN SAMPLE. Record result.
12. Press
OFF button to turn the meter off or press EXIT button to exit to a
previous menu or make another menu selection.
þ NOTES: 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 is obtained.
For the most accurate results, the sample and reagents should be at 25 ±4°C.
Hydrogen Peroxide–HR 2/2 Smart2 TEST PROCEDURES 4.08