Lamotte SMART3 Colorimeter User Manual download pdf (Page 233)

ERYTHORBIC ACID PROCEDURE

1. Press and hold until colorimeter turns on.

2. Press

ENTER

to select TESTING MENU.

3. Select ALL TESTS (or another sequence containing 039 Erythorbic Acid)

from TESTING MENU.

4. Scroll to and select 039 Erythorbic Acid 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 the tube from colorimeter.

8. Add 3 drops of *DEHA Reagent #1 (4791). Swirl to mix.

9. Add 3 drops of *DEHA Reagent #2 (4792). Swirl to mix.

10. Add 3 drops of *DEHA Reagent #3 (4793). Invert 3 times to mix.

11. Insert the tube into chamber. Close lid.

12. Wait 15 minutes. Do not open the lid during the waiting time. The reaction is

photosensitive.

13. Remove tube from chamber. Invert 2 times to mix.

14. Immediately insert tube into chamber, close lid and select SCAN SAMPLE.

Read within 30 seconds. Record result in ppm erythorbic acid.

15. Press

to turn the colorimeter off or press

EXIT

to exit to a previous

menu or make another menu selection.

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.

SMART3 Test Procedures 11.10 OXYGEN SCAVENGERS

Test Procedures

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Lamotte SMART3 Colorimeter User Manual Page 233