17
• Replace the cuvette into the holder and ensure that the notch on the cap is positioned securely
into the groove.
• Press
READ
and the lamp, cuvette and detector icons will appear on the display, depending
on the measurement phase.
• At the end of measurement, the instrument directly displays concentration in mg/L of fluoride
on the LCD.
Note: With wastewater and seawater samples, before performing any measurement a
distillation of the sample is needed.
MEASUREMENT PROCEDURE
INTERFERENCES:
Negative 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
Positive interferences may be caused by:
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.
