LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 75)

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 7 Boron) from
TESTING MENU
.
5. Scroll to and select 7 Boron from menu.
6. Rinse a tube (0290) with sample water. Fill to 10 mL line with sample.
7. Insert the tube into chamber, close lid and select SCAN BLANK.
8. Remove the tube from colorimeter.
9. Use the 1.0 mL pipet (0354) to add 2 mL of *Boron Buffer (4869). Cap
and mix.
10. Use the 0.15 g spoon (0727) to add one level measure of *Boron Indicator
Powder (4870). Press full spoon against side of jar to compress powder.
Scrape off excess powder on inside neck of bottle. Tap excess off spoon
handle.
11. Cap and shake vigorously for 30 seconds.
12. Insert the tube into chamber. Close lid.
13. Wait 30 minutes. Do not open the lid during the waiting time. The
reaction is photosensitive.
14. Remove tube from chamber. Invert several times to mix.
15. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result in ppm boron.
16. Press
OFF button to turn the colorimeter off or press EXIT button 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 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.
BORON 2/2 COD PLUS TEST PROCEDURES 2/04