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DR/2400
UniCell™ Vials
Scope and Application:
Tips and Techniques
• Adjust pH of preserved samples to between pH 3–9 before analysis.
• 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 in the procedure manual for information on adjusting the calibration curve.
• Make sure that the temperature of the water sample and the sample vial is between 15–25 °C.
• 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
803 Chromium, HCT 156
Touch
.
Start
ChromiumTot_UniCell_Other_DCH_Eng_Ody.fm
For water and wastewater
2.
Pipet 4.0 mL of
sample into a sample
vial.
Chromium, Total
1,5-Diphenylcarbohydrazide Method
(0.03 to 1.00 mg/L Tot-Cr)
3.
Screw a blue
UniCap A (HCT 156 A)
onto the sample vial.
4.
Invert the sample vial
several times to mix.
Chromium, Total
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