87
FLUORIDE LOW RANGE
• 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 second cuvette (#2) with the reacted sample into the
instrument and close the lid.
• Press Read to start reading. The instrument displays the results in mg/L of fluoride (F
-
).
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
deionized water and 8 mL of sample.
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
ortho‑Phosphate 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.
# 2
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