DR/2400
Chlorine, Free
ChlorineFre_AVPP_Other_DPD_Eng_Ody.fm Page 1 of 6
• Analyze samples immediately. Do not preserve for later analysis.
• After adding reagent to the sample cell, a pink color will develop if free chlorine is present.
• If the test overranges, dilute the sample with a known volume of high quality, chlorine demand-free water (Cat. No. 26415-49) and
repeat the test. Some loss of chlorine may occur due to the dilution. Multiply the result by the dilution factor. See Section 2.7
Sample Dilution on page 21.
• 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.
Chlorine, Free
(Method 8021
DPD Method*
*Adapted from Standard Methods for the Examination of Water and Wastewater.
Powder Pillows or AccuVac
®
Ampuls
(0.02 to 2.00 mg/L)
Scope and Application: For testing free chlorine (hypochlorous acid and hypochlorite ion) in water,
treated waters, estuary, and seawater. USEPA accepted for reporting for drinking water analyses.**
** Procedure is equivalent to USEPA method 330.5 and Standard Method 4500-Cl G for drinking water.
1. Touch
Hach Programs.
Select program
80 Chlor. F & T.
Touch
Start.
2. Fill a round sample
cell with 10 mL of
sample. (This is the
blank.)
3. Wipe the blank and
place it into the cell
holder.
4. Touch Zero.
The display will show:
0.00 mg/L Cl
2
Tips and Techniques
Powder Pillows Method 8021
Hach Programs
10 mL
Zero
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