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DR/2400
Method 10102
Test 'N Tube™ Vials
Scope and Application:
hypochlorite ion) in drinking water, cooling water, and industrial process water.
* Adapted from Standard Methods for the Examination of Water and Wastewater.
Tips and Techniques
• 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
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.
Test 'N Tube
Hach Programs
1.
Touch
.
Hach Programs
Select program
89 Chlor. F&T HR TNT
Touch
.
Start
ChlorineFre_TNT_Other_DPD_Eng_Ody.fm
For testing higher levels of free chlorine (hypochlorous acid and
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.
Chlorine, Free
DPD Method*
(0.09 to 5.00 mg/L)
.
See the
Method 10102
Zero
4.
Touch
.
Zero
The display will show:
0.00 mg/L Cl
2
Chlorine, Free
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