55
• Press Timer and the display will show the countdown prior to zeroing the blank or, alternatively, wait
for two minutes and press Zero. The display will show “-0.0-” when the meter is zeroed and ready for
measurement.
• Remove the cuvette.
• Insert the other cuvette (# 2) with the reacted sample into the
instrument.
• Press Read to start reading. The instrument displays the results in mg/L of fluoride.
Note: For wastewater or seawater samples, before performing measurements, distillation is required.
For most accurate results, use two graduated pipettes to deliver exactly 8 mL of distilled water and
8 mL of sample.
Fluoride
# 2
INTERFERENCES
Interferences may be caused by:
Alkalinity (as CaCO
3
) above 5000 mg/L
Aluminum above 0.1 mg/L
Iron, ferric above 10 mg/L
Chloride above 700 mg/L
Phosphate, ortho above 16 mg/L
Sodium hexametaphosphate above 1.0 mg/L
Sulfate above 200 mg/L
Highly colored and turbid samples may require distillation
Highly alkaline samples can be neutralized with nitric acid.
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