LaMotte SMART 2 - Manual (Page 156)

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 2/3 Smart2 TEST PROCEDURES 2.04