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DR/2400
UniCell™ Vials
Scope and Application:
surface water, and process control
Tips and Techniques
• Adjust the pH of preserved samples to between pH 2–10 before testing.
• Clean the outside of the vial before placing it in the instrument. Wipe with a damp towel followed by a dry one.
• Use the standard solution or standard addition method to verify results (see Accuracy Check on page 4).
• See Adjusting the Standard Curve on page 40 for information on adjusting the calibration curve.
• Make sure the temperature of the water sample and the sample vial is between 18–20 °C. Temperatures outside of this range will
affect the color of the reaction and therefore may give inaccurate results.
• Underrange appears on the display when the instrument is zeroed or when the determined sample concentration is below the
operating range listed for this method.
UniCell Vials
Hach Programs
1.
Touch
.
Hach Programs
Select program
806 Phosphate HCT 121
Touch
.
Start
PhosphorusTot_UniCell_APD_Eng_Ody.fm
Ascorbic Acid Method with Acid Persulfate Digestion
For water, wastewater, boiler water,
2.
Pipet 1.0 mL of
sample into a sample
vial.
.
Phosphorus, Total
(1.5 to 15.0 mg/L PO
3.
Screw a blue
UniCap A (HCT 121 A)
onto the sample vial.
3–
4
4.
Invert the sample vial
repeatedly until the solid
reagent in the cap is
dissolved.
Phosphorus, Total
Page 1 of 6
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