LaMotte SMART Spectro Spectrophotometer - Manual (Page 216)

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
85 Silica Lo
) from TESTING MENU.
4. Scroll to and select 85 Silica Lo from menu.
5. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with
sample.
6. Insert tube into chamber, close lid and select SCAN BLANK. (See Note)
7. Remove tube from Spectro. Add 6 drops *Silica Reagent #1 (V-4466). Cap
and invert to mix.
8. Add 12 drops of *Silica Reagent #2 (V-4467). Cap and mix. Wait 5
minutes.
9. Add 8 drops of *Silica Reagent #3 (V-4468). Cap and mix. Wait 2
minutes.
10. Use the 0.1 g spoon (0699) to add one measure of *Silica Reagent #4
(V-6284). Cap and mix gently until powder has dissolved. Wait 5 minutes
for full color development.
11. At end of 5 minute waiting period, mix, insert tube into chamber, close lid
and select SCAN SAMPLE. Record result.
12. Press
OFF button to turn 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.
SMART SPECTRO TEST PROCEDURES 05.04 Silica–LR 3/3