DR/2400
Hardness, Total
Hardness_PT_ULow_CPZ_Eng_Ody.fm Page 1 of 6
• Pre-clean the Pour-Thru Cell and all labware as specified in Treating Analysis Labware on page 4.
• Protect the Pour-Thru Cell from contamination when not in use by inverting a small beaker over the top of the glass funnel.
• If the sample concentration is greater than 750 µg/L, a 1:1 dilution of the sample is recommended for greatest accuracy. Use
ultra-pure (aldehyde-free) water for the dilution. Repeat the analysis on the diluted sample and multiply the resulting
concentration by two. See Correcting for a Diluted Sample in the instrument manual for more information.
• Alternate forms should only be used when the sample is known to contain only Mg or Ca. This method does not distinguish
between the two forms.
• Use dedicated plastic ware for this analysis.
• 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.
Hardness, Total
Method 8374
Calcium and Magnesium; Chlorophosphonazo Rapid Liquid Method
Pour-Thru Cell
ULR (1 to 1,000 µg/L Ca & Mg as CaCO
3
)
Scope and Application: For boiler, cooling, and ultra pure water
1. Touch
Hach Programs.
Select program
227 Hardness, Tot. 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. Fill a clean, 125-mL
plastic Erlenmeyer flask
to overflowing with
sample.
Note: Collect sample directly in
the flask if possible.
4. Rinse a clean, 50-mL
plastic graduated
cylinder three times with
sample.
Tips and Techniques
DR/2400 Pour-Thru Cell Method 8374
Hach Programs
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