DR/2400
Chlorine, Total
ChlorineTot_PT_ULow_DPD_Eng_Ody.fm Page 1 of 8
• Analyze samples immediately. Chlorine is not stable in an aqueous solution.
• A reagent blank value for a combined lot of indicator/buffer reagent solutions should be determined at least once a day. If sample
color or turbidity fluctuates frequently during the day, determine a reagent blank for each sample. See Determining the Reagent
Blank Value on page 3. To store the reagent blank value, see Creating a User Program Based on a Hach Program in the
instrument manual.
• The ampules contain more than 1.0 mL of solution for ease of transfer. Discard excess reagent in the ampule.
• Install the Pour-Thru Cell into the adapter so that the long pathlength (1-in./25-mm) is parallel to the front of the instrument.
Chlorine, Total
(Method 8370
DPD Method*
* U.S. Patent 5,362,650
Pour-Thru Cell
ULR (2 to 500 µg/L as Cl
2
)
Scope and Application: For detecting trace levels of chlorine and chloramines in clean waters relatively
free of color and turbidity; USEPA accepted for reporting for drinking water analysis
1. Touch
Hach Programs.
Select program
86 Chlor. Total ULR.
Touch
Start.
2. Install the Pour-Thru
Cell and the multi-
pathlength cell adapter in
the sample cell
compartment. Use the 25-
mm cell pathlength.
Note: See Section 2.6.1 on
page 26 in the Instrument
manual for installation details.
Flush with 50-mL of
deionized water.
3. Pour at least 50 mL of
sample into the
Pour-Thru Cell.
4. After the flow stops,
touch the timer icon.
Touch
OK.
A three-minute reaction
period will begin. This
time allows turbidity or
solids to settle and ensures
a stable reading.
Tips and Techniques
DR/2400 Pour-Thru Cell Method 8370
Hach Programs
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