LaMotte SMART Spectro Spectrophotometer - Manual (Page 238)

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.
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.
SMART Spectro Test Procedures 2.11 SILICA, Low Range
Test P
rocedures