DR/2400
Chlorine, Total
ChlorineTot_PT2_ULow_DPD_Eng_Ody.fm Page 1 of 10
• 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. See
Determining the Reagent Blank Value on page 4. To store the reagent blank value, see Creating a User Program Based on a
Hach Program in the instrument manual.
• The reagent blank value is normally less than 5 µg/L. If the value is greater than 5 µg/L, an interfering substance may be present
in the blanking water or the DPD Indicator may be degrading. If there is doubt about the reagents, repeat the reagent blank
determination using chlorine-demand-free water for the sample. Blanks up to 5 µg/L may be used.
• Use a new filter for each test. Using an unspecified filter may give low analysis results or inability to filter the required volume.
• 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 10014
DPD Method*
*Adapted from Standard Methods for the Examination of Water and Wastewater.
Pour-Thru Cell
ULR (2 to 500 µg/L as Cl
2
)
Scope and Application: For testing trace levels of chlorine and chloramines in treated domestic and
industrial wastewater; USEPA accepted for reporting for wastewater analysis**
** U.S. Patent 5,362,650 covers the procedure. U.S. Patent 5,549,816 covers the OriFlo™ Filtration System.
1. Touch
Hach Programs.
Select program
86 Chlor. Total ULR.
Touch
Start.
2. Install the Pour-Thru
Cell and 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. Unscrew the cap from
the OriFlo™ plunger
assembly. Be sure that the
O-ring is properly seated
in the cap.
4. Install a new,
3-micron filter into the
cap well. Wet the filter
with a few drops of
deionized water.
Reassemble and hand-
tighten the cap onto the
plunger.
Tips and Techniques
DR/2400 Pour-Thru Cell Method 10014
Hach Programs
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