LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 121)

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 26 Sulfide-LR)
from TESTING MENU.
5. Scroll to and select 26 Sulfide-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.
8. Remove tube from colorimeter. Use the 1.0 mL pipet (0354) to add 1.0
mL of *Sulfide Reagent A (V-4458). Cap and mix.
9. Add 6 drops of Sulfide Reagent B (V-4459). Cap and mix. Wait 1 minute.
Solution will turn blue if sulfides are present.
10. Use the 1.0 mL pipet (0354) to add 2.0 mL of Sulfide Reagent C (4460).
Cap and mix. Color development is immediate and stable.
11. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result.
12. Press
OFF button to turn colorimeter off or press EXIT button to exit to a
previous menu or make another menu selection.
SULFIDE - LOW RANGE 2/2 COD PLUS TEST PROCEDURES 6/02