DR/2400
Fluoride
Fluoride_UniCell_Other_SPA_Eng_Ody.fm Page 1 of 4
• Analyze samples collected in acid-cleaned glass or plastic bottles as quickly as possible.
• Adjust the pH of the sample to between 1–11 with hydrochloric acid 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.
Fluoride
SPADNS
UniCell™ Vials
(0.10 to 1.50 mg/L F
–
)
Scope and Application: For drinking water, ground water, surface water, wastewater,
and process control
1. Touch
Hach Programs.
Select program
810 Fluoride, HCT 132
Touch Start.
2. Install the 16-mm cell
adapter.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for adapter installation
details.
Wipe an empty sample vial
and place it into the cell
adapter.
3. Touch Zero.
The display will show:
0.00 mg/L F
–
Underrange
4. Remove the sample
vial from the instrument,
uncap the vial, and pipet
5.0 mL of sample into it.
Tips and Techniques
UniCell Vials
Hach Programs
Zero
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