DR/2400
Chlorine, Free
ChlorineFre_TNT_Other_DPD_Eng_Ody.fm Page 1 of 4
• Analyze samples immediately. Do not preserve samples for later analysis.
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust
. See the
instrument manual for more information on Running a Reagent Blank.
• After adding sample to the Test ‘N Tube™, a pink color will develop if free chlorine is present.
• 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 10102
DPD Method*
*Adapted from Standard Methods for the Examination of Water and Wastewater.
Test ‘N Tube™ Vials
(0.09 to 5.00 mg/L)
Scope and Application: For testing higher levels of free chlorine (hypochlorous acid and
hypochlorite ion) in drinking water, cooling water, and industrial process water.
1. Touch
Hach Programs.
Select program
89 Chlor. F&T HR TNT.
Touch
Start.
2. Fill an empty
Test ‘N Tube™ vial to the
top of the Hach label with
sample (This is the
blank.)
3. Install the 16-mm cell
adapter.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for adapter installation
details.
Wipe the blank and place
it into the adapter.
4. Touch Zero.
The display will show:
0.00 mg/L Cl
2
Tips and Techniques
Test ‘N Tube Method 10102
Hach Programs
Zero
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