LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 81)

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 10 Cu-Cuprizone)
from TESTING MENU.
5. Scroll to and select 10 Cu-Cuprizone from menu.
6. Rinse a tube (0290) with sample water. Fill to the 10 mL line with sample.
7. Insert the tube into chamber, close lid and select SCAN BLANK.
8. Remove tube from colorimeter and add 5 drops of Copper A (6367). Cap
and mix.
9. Add 5 drops of *Copper B (6368). Cap and mix.
10. Wait 5 minutes. Mix.
11. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result.
12. Press
OFF button to turn the colorimeter off or press EXIT button to exit
to a previous menu or make another menu selection.
NOTES:
l 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 are obtained.
The reaction may stain the tubes. Scrub tubes thoroughly after each use.
COPPER - DDC 2/2 COD PLUS TEST PROCEDURES 6/02