LaMotte DC1500-CL Manual page 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.
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.
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