Test Procedures
APPLICATION
Drinking and surface waters; domestic and industrial waters.
RANGE:
0.0–2.0 ppm Fluoride
MDL:
0.1 ppm
METHOD:
Colorimetric test based upon the reaction between fl uoride
and zirconium dye lake. The fl uoride reacts with the dye
lake, dissociating a portion of it into a colorless complex ion
and dye. As the fl uoride concentration increases, the color
produced becomes progressively lighter.
SAMPLE HANDLING &
PRESERVATION:
Samples may be stored and refrigerated in plastic containers.
INTERFERENCES:
The following substances produce a positive interference at
the concentration given:
Chloride (Cl–)
Phosphate (PO
4
–3
)
Hexametaphosphate (NaPO
3
)
6
The following substances produce a negative interference at
the concentration given:
Alkalinity (CaCO
3
) 5000 mg/L
Aluminum (Al
3+
)
0.1
mg/L
Iron (Fe
3+
) 10
mg/L
Sulfate (SO
4
–2
)
200
mg/L
Color and turbidity must be removed or compensated for in
the procedure. Temperature should be maintained within 5°C
of room temperature.
FLUORIDE
SMART Spectro 2 Test Procedures 05.02.16
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