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DR/2400
UniCell™ Vials
Scope and Application:
Tips and Techniques
• Adjust the pH of preserved samples to between pH 3–10 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).
• See Section 3.2.4 Adjusting the Standard Curve on page 40 for information on adjusting the calibration curve.
• Make sure that the temperature of the sample and the reagents is between 20 and 24 °C. Higher temperatures can cause
high-bias results; lower temperatures can cause low-bias results.
UniCell Vials
Hach Programs
1.
Touch
.
Hach Programs
Select program
.
805 Nitrate, HCT 106
Touch
.
Start
Nitrate_UniCell_Dimeth_Eng_Ody.fm
For water and wastewater
2.
Pipet 0.2 mL of
Dimethylphenol
Solution A (HCT 106 A)
into a sample vial.
(0.2 to 13.5 mg/L NO
3.
Cap the vial and
invert 3 times to mix.
Nitrate
Dimethylphenol
(1.0 to 60.0 mg/L NO
–
–N)
3
4.
Immediately pipet
1.0 mL of sample into the
vial.
Nitrate
Page 1 of 4
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