LaMotte SMART Spectro Spectrophotometer - Manual (Page 83)

PROCEDURE B: BROMINE IN THE PRESENCE OF
CHLORINE
Use universal sample holder.
1. Press USE button to turn on colorimeter.
2. Scroll to and select ALL TESTS (or another sequence containing
9 Bromine-LR
) from TESTING MENU.
3. Scroll to and select 9 Bromine-LR from menu.
4. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with
sample.
5. Insert tube into chamber close lid and select SCAN BLANK.
6. Rinse a second clean tube (0290) with sample water. Fill to the 10 mL line
with sample. Add 5 drops of Glycine Solution (6811). Cap and mix.
7. Remove blank from Spectro. Pour out all of the sample water. To this tube
add just enough of Glycine treated sample (Step 6) to cover a tablet. Add
one *Chlorine DPD#1 Instrument Grade Tablet (6903A). Crush tablet
with a tablet crusher (0175). Add all remaining Glycine-treated sample.
Cap tube and shake until tablet dissolves. Solution will turn pink if
bromine is present. Wait 15 seconds. Mix.
8. Insert tube into chamber, close lid and select SCAN SAMPLE.
9. Press OFF button to exit to previous menu or make another menu
selection.
PROCEDURE C: FREE AVAILABLE, TOTAL AVAILABLE &
COMBINED CHLORINE IN THE PRESENCE OF BROMINE
1. Perform the test for free and combined chlorine as previously described.
2. Perform the test for bromine in the presence of chlorine.
3. Calculations:
Residual Bromine (ppm) =
Reading BR
Free Chlorine in the Presence of Bromine =
Free Chlorine–0.45 (Reading BR)
Total Chlorine in the Presence of Bromine =
Total Chlorine–0.45 (Reading BR)
Combined Chlorine in the Presence of Bromine =
Total Chlorine–Free Chlorine
þNOTE: Combined chlorine is not affected by the presence of bromine, so
the calculation is the same as when only chlorine is present.
Chlorine–Bromine–Iodine 6/8 SMART SPECTRO TEST PROCEDURES 04.08