LaMotte SMART3 Colorimeter - Manual (Page 91)

BENZOTRIAZOLE PROCEDURE
1. Press and hold until colorimeter turns on.
2. Press ENTER to select Testing Menu.
3. Select ALL TESTS (or another sequence containing 009 Benzotriazole)from
TESTING MENU.
4. Scroll to and select 009 Benzotriazole from menu.
5. Rinse a tube (0290) with sample water. Fill to 10 mL with sample.
6. Insert the tube into chamber, close lid and select SCAN BLANK.
7. Remove the tube from colorimeter. Discard the sample.
8. Adjust the sample water temperature to between 20 and 25°C if necessary.
9. Fill the graduated cylinder (0417) to the 25 mL line with sample water. Transfer
to the Erlenmeyer Flask (2-2109).
10. 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.
11. Add 10 drops of Potassium Sodium Tartrate (7841WT).
12. Use the 0.25 g spoon (0695) to add one measure of *Benzotriazole Reagent
(3818). Swirl to mix until the powder has dissolved.
13. Replace the fl ask in the slot in the case. Insert the Pen-Ray Lamp (31041-1)
into the fl ask. Plug in the Pen-Ray Power Source (31041-2) and turn the lamp
on for exactly 5 minutes. Remove the lamp from the fl ask. Rinse and wipe the
lamp dry.
14. Fill a test tube (0290) to the 10 mL line with the digested sample. Cap tube.
15. Insert tube into chamber, close lid and select SCAN SAMPLE. Record result in
ppm Benzotriazole.
16. Press to turn the colorimeter off or press
EXIT
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 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.
SMART3 Test Procedures 11.10 BENZOTRIAZOLE/TOLYTRIAZOLE
Test P
rocedures