LaMotte SMART 2 - Manual (Page 98)

PROCEDURE B:
BROMINE IN THE PRESENCE OF CHLORINE
1. Press and hold ON button until colorimeter turns on.
2. Press ENTER to start.
3. Press ENTER to select TESTING MENU.
4. Select ALL TESTS (or another sequence containing 9 Bromine-LR)
from TESTING MENU.
5. Scroll to and select 9 Bromine-LR from menu.
6. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with
sample.
7. Insert tube into chamber close lid and select SCAN BLANK
.
8. 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.
9. Remove blank from colorimeter. Pour out all of the sample water. To this
tube add just enough of Glycine treated sample (Step 8) to cover a tablet.
Add one *DPD#1 Instrument Grade Tablet (6903). 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.
10. Insert tube into chamber, close lid and select SCAN SAMPLE
.
11. 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
þ NOTE: 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 Smart2 TEST PROCEDURES 4.08