DR/2400
Hardness, Total
Hardness_MP_ULow_CPZ_Eng_2400.fm Page 1 of 6
• Pre-clean the Pour-Thru Cell and all labware as specified in Treating Analysis Labware on page 3.
• 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 plasticware for this analysis. Plastic sample cells must be used. Glass will contaminate the sample.
Hardness, Total
Method 8374
Calcium and Magnesium; Chlorophosphonazo Method
Multi-pathlength 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 cell and cell
adapter in the sample cell
compartment. Flush with
50-mL of ultra-pure
water.
3. Rinse a plastic
multi-pathlength sample
cell and the cap three
times with the water to
be tested. Do not allow
the underside of the cap
to come into contact with
surfaces that may
contaminate it.
4. Fill the plastic
multi-pathlength cell to
the 25-mL mark with
sample.
Tips and Techniques
Multi-pathlength Cell Method 8374
Hach Programs
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