7
6. Rinse a clean tube (0290) with
sample water. Fill to the 10 mL
line with sample. Cap and wipe
dry.
7. Insert tube into chamber, close
lid and select
Scan Blank
.
8. Remove tube from colorimeter.
Add one *Chlorine DPD #1
Instrument Grade Tablet
(6903A).
Cap tube and shake for 10
seconds. Invert slowly 5 times.
Solution will turn pink if free
chlorine is present.
9. Immediately insert tube into
chamber. Close lid. Select
Scan
Sample
. Record result as Free
Chlorine.
Chlorine TT
0.99
ppm
Scan BLank
Scan Sample
12:00:00 001/500
PROCEDURE – COMBINED CHLORINE
10. Remove tube from colorimeter.
Add one *Chlorine DPD #3
Instrument Grade Tablet
(6197A) to sample from Step 8.
Cap tube and shake for 10
seconds. Invert slowly 5 times.
An increase in color represents
combined chlorine.
NOTE: For wastewater samples,
Standard Methods for the Examination of Water and
Wastewater
recommends waiting 2 minutes for full color development when testing
total chlorine.
Chlorine
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