DR/2400
Phosphorus, Reactive
PhosphorusReac_PT_Low_ASC_Eng_Ody.fm Page 1 of 6
• 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.
• See Reagent Preparation on page 3 for preparing the Ascorbic Acid reagent.
• Reaction time depends on sample temperature. For most accurate results, samples should be at room temperature (about 20 °C).
• Obtain a reagent blank for each lot of reagent when the phosphate concentration is less than 750 µg/L. Follow the procedure
using deionized water in place of the sample. Subtract the reagent blank value from the final results.
• 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.
Phosphorus, Reactive
Method 10055
Ascorbic Acid Rapid Liquid Method*
*Adapted from Standard Methods for the Examination of Water and Wastewater.
Pour-Thru Cell
LR (19 to 3,000 µg/L PO
4
3–
)
Scope and Application: For treated and natural waters
1. Touch
Hach Programs.
Select program
488 P React. LR RL.
Touch
Start.
2. Install the Pour-Thru
Cell and multi-
pathlength cell adapter
in the sample cell
compartment.
Note: See Section 2.6.1 on
page 26 in the Instrument
manual for installation details.
Flush with 50-mL of
deionized water.
Note: Use the 25-mm cell
pathlength.
3. Rinse two clean
Erlenmeyer flasks three
times with the sample.
4. Rinse a clean 25-mL
plastic graduated
cylinder three times with
the sample.
Tips and Techniques
DR/2400 Pour-Thru Cell Method 10055
Hach Programs
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