LaMotte SMART 2 - Manual (Page 73)

BENZOTRIAZOLE 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 B triazole
from TESTING MENU.
5. Scroll to and select 10 B triazole from menu.
6. Rinse a tube (0290) with sample water. Fill to 10 mL with sample.
7. Insert the tube into chamber, close lid and select SCAN BLANK.
8. Remove the tube from colorimeter. Discard the sample.
9. Adjust the sample water temperature to between 20 and 25
°C if necessary.
10. Fill the graduated cylinder (0417) to the 25 mL line with sample water.
Transfer to the Erlenmeyer Flask (2-2109).
11. Use the pH Test Paper (2956) to check the pH of the sample. If the pH is
not between 4 and 6, add one drop of *Sulfuric Acid, 1.0N (6139). Swirl
to mix. Continue adding *Sulfuric Acid, 1.0N (6139) one drop at a time,
swirling to mix and checking the pH after each drop, until the pH is
between 4 and 6.
12. Add 10 drops of Potassium Sodium Tartrate (7841WT).
13. Use the 0.25 g spoon (0695) to add one measure of *Benzotriazole
Reagent (3818). Swirl to mix until the powder has dissolved.
14. Replace the flask in the slot in the case. Insert the Pen-Ray Lamp
(31041-1) into the flask. Plug in the Pen-Ray Power Source (31041-2)
and turn the lamp on for exactly 5 minutes. Remove the lamp from the
flask. Rinse and wipe the lamp dry.
15. Fill a test tube (0290) to the 10 mL line with the digested sample. Cap
tube.
16. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result in ppm Benzotriazole.
17. Press OFF button to turn the colorimeter off or press EXIT button to exit
to a previous menu or make another menu selection.
þ 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.
Smart2 TEST PROCEDURES 7.06 Benzotriazole/Tolyltriazole 3/4