LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 106)

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 20 Phosphate L)
from TESTING MENU.
5. Scroll to and select 20 Phosphate L 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 1.0 mL pipet (0354) to add 1.0 mL of
*Phosphate Acid Reagent (V-6282). Cap and mix.
9. Use the 0.1 g spoon (0699) to add one measure of *Phosphate Reducing
Reagent (V-6283). Cap and shake until powder dissolves. Wait 5 minutes
for full color development. Solution will turn blue if phosphates are
present.
10. At end of 5 minute waiting period, mix, insert tube into chamber, close lid
and select SCAN SAMPLE. Record result.
11. Press
OFF button to turn colorimeter off or press EXIT button to exit to a
previous menu or make another menu selection.
COD PLUS TEST PROCEDURES 6/02 PHOSPHATE - LOW RANGE 3/3