LaMotte SMART Spectro Spectrophotometer - Manual (Page 65)

PROCEDURE
Use universal sample holder
1. Press and hold
ON button until spectrophotometer turns on.
2. Scroll to and select PROGRAMMED TESTS.
3. Select ALL TESTS (or another sequence containing 7 Biguanide
from TESTING MENU.
4. Scroll to and select 7 Biguanide 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.
8. Use the 1.0 mL pipet (0354) to add 2.0 mL of Biguanide Indicator (3994).
Cap and invert three times to mix.
9. Wait 1 minute.
10. Insert the tube into chamber. Close lid.
11. Select SCAN SAMPLE. Record result in ppm Biguanide
12. Press
OFF button to turn the spectrophotometer off or press EXIT button
to exit to a previous menu or make another menu selection.
þNOTE: 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 are obtained.
Biguanide 2/2 SMART SPECTRO TEST PROCEDURES 05.04