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DR/2400
Method 8065
Scope and Application:
* Adapted from Harp, Klein, and Schoonover, Jour. Amer. Water Works Assn., 73 387–388 (1981).
Tips and Techniques
• 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.
Powder Pillows
Hach Programs
1.
Touch
.
Hach Programs
Select program
72 Chlor Diox, CPR LR
Touch
.
Start
ChlorineDio_PP_Low_CPR_Eng_Ody.fm
For water and wastewater
2.
Fill two 50-mL
mixing cylinders to the
50-mL mark with sample.
.
Chlorine Dioxide
Chlorophenol Red Method*
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.
LR (0.01 to 1.00 mg/L)
Method 8065
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.
Chlorine Dioxide
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