LaMotte SMART3 Colorimeter - Manual (Page 239)

PROCEDURE - OZONE WITH CHLORINE PRESENT
1. Press and hold until colorimeter turns on.
2. Press ENTER to select TESTING MENU.
3. Select ALL TESTS (or another sequence containing 070 Ozone DPD) from
TESTING MENU.
4. Scroll to and select 070 Ozone DPD from menu.
5. Rinse a tube (0290) with sample water. Fill to 10 mL with sample.
6. Insert the tube into chamber, close lid and select SCAN BLANK.
7. Remove tube from colorimeter.
8. Add 5 drops *DPD #3 Total Chlorine Reagent (6743). Swirl to mix.
9. Add 5 drops DPD #1 A Free Chlorine Reagent (6740) and 5 drops *DPD #1B
Free Chlorine Reagent (6741).
10. Cap and invert to mix. Make reading within 30 seconds.
11. Insert tube into chamber, close lid and select SCAN SAMPLE. Record result
as Reading A (ozone + total chlorine).
12. Rinse a tube (0290) with sample water. Fill to 10 mL with sample.
13. Add 5 drops of Glycine Solution (6811). Swirl to mix.
14. Add 5 drops *DPD #3 Total Chlorine Reagent (6743). Swirl to mix.
15. Add 5 drops DPD #1 A Free Chlorine Reagent (6740) and 5 drops *DPD #1B
Free Chlorine Reagent (6741).
16. Cap and invert to mix. Make reading within 30 seconds.
17. Insert tube into chamber, close lid and select SCAN SAMPLE. Record result
as Reading B (ozone).
18. Calculate the ozone concentration in mg/L ozone.
Reading A – Reading B = mg/L ozone
19. Press to turn the meter off or press
EXIT
to exit to a previous menu or
make another menu selection.
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 are obtained.
SMART3 Test Procedures 11.10 OZONE, DPD, Liquid
Test P
rocedures