LaMotte SMART Spectro Spectrophotometer - Manual (Page 225)

PROCEDURE
Use universal sample holder.
1. Press and hold
ON button until spectrophotometer turns on.
2. Scroll to and select PROGRAMMED TESTS.
3. Scroll to and select ALL TESTS (or another sequence containing
94 Surfactants
) from TESTING MENU.
4. Scroll to and select 94 Surfactants from menu.
5. Rinse a tube (0290) with sample water. Fill to 10 mL line with sample.
6. Insert the tube into chamber, close lid and select SCAN BLANK.
7. Remove the tube from Spectro.
8. Use the 0.5 g spoon (0698) to add 0.5 g pH Adjustment Powder (4509).
Cap and mix until powder dissolves.
9. Use the 0.1 g spoon (0699) to add two measures of Sodium Chloride
Reagent (4877). Cap and mix until powder disintegrates.
10. Use the 1.0 pipet (0354) to add 2.0 mL of *DS Indicator (4508).
11. Cap and shake for 1 minute.
12. Wait 5 minutes. DO NOT MIX.
13. Insert tube into chamber, close lid and select SCAN SAMPLE. Record
result in ppm LAS.
14. 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 is obtained.
Surfactants 2/2 SMART SPECTRO TEST PROCEDURES 05.04