DR/2400
Sulfate
Sulfate_UniCell_Other_Turb_Eng_Ody.fm Page 1 of 4
• 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 2.).
• 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 (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.
Sulfate
Turbidimetric Method
UniCell™ Vials
Scope and Application: For wastewater, raw water, and process control
(40 to 150 mg/L SO
4
2–
)
1. Touch
Hach Programs.
Select program
811 Sulfate, HCT 125.
Touch
Start.
2. Add 5 mL of sample
to a sample vial.
3. Add one spoonful
of Barium Chloride A
(HCT 125 A) into the
sample vial.
4. Immediately cap the
sample vial and invert to
mix. Mix for 2 minutes.
Tips and Techniques
UniCell Vials
Hach Programs
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