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DR/2400
UniCell™ Vials
Scope and Application:
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 3.).
• See Section 3.2.4 in the procedure manual for information on adjusting the calibration curve.
• Make sure the temperature of the water sample and the sample vial is between 15–25 °C (59–77 °F). Temperatures outside of
this range 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
.
812 Sulfate, HCT 126
Touch
.
Start
Sulfate_UniCell_Turb_Eng_Ody.fm
For wastewater, raw water, and process control
2.
Add 2 mL of sample
to a sample vial.
3.
Add one spoonful of
Barium Chloride A
(HCT 126 A) into the
sample vial.
Sulfate
Turbidimetric Method
(150 to 900 mg/L SO
4.
Immediately cap the
sample vial and invert to
mix. Mix for 1 minute.
Sulfate
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