DR/2400
Chlorine Dioxide
ChlorineDio_PP_Low_CPR_Eng_Ody.fm Page 1 of 4
• Analyze samples immediately because chlorine dioxide is unstable and volatile. See Sample Collection, Storage and
Preservation.
• For most accurate results, analyze each portion of sample at the same temperature.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• A TenSette
®
pipet (Cat. No. 19700-01) may be used to dispense Chlorine Dioxide Reagent 1 and Chlorine Dioxide Reagent 3.
Chlorine Dioxide
Method 8065
Chlorophenol Red Method*
LR (0.01 to 1.00 mg/L)
Scope and Application: For water and wastewater
* Adapted from Harp, Klein, and Schoonover, Jour. Amer. Water Works Assn., 73 387–388 (1981).
1. Touch
Hach Programs.
Select program
72 Chlor Diox, CPR LR.
Touch
Start.
2. Fill two 50-mL
mixing cylinders to the
50-mL mark with sample.
3. Use a volumetric
pipet and pipet filler to
add 1.0 mL of Chlorine
Dioxide Reagent 1 to each
cylinder. Stopper. Invert
several times to mix.
4. Add the contents of
one Dechlorinating
Reagent Powder Pillow
to one cylinder. (This is
the blank).
Stopper and invert several
times until dissolved.
Note: The second cylinder,
which does not receive
dechlorinating reagent, is the
prepared sample.
Tips and Techniques
Powder Pillows Method 8065
Hach Programs
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