LaMotte SMART3 Colorimeter - Manual (Page 178)

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 SMART3 Test Procedures 11.10
Test P
rocedures