Hanna Instruments HI 83208 - Manual (Page 37)

37 Iron LR
INTERFERENCES
Interference may be caused by:
Cadmium above 4.0 mg/L
Chromium
3+ above 0.25 mg/L
Chromium 6+ above 1.2 mg/L
Cobalt above 0.05 mg/L
Copper above 0.6 mg/L
Cyanide above 2.8 mg/L
Manganese above 50.0 mg/L
Mercury above 0.4 mg/L
Molybdenum above 4.0 mg/L
Nickel above 1.0 mg/L
Nitrite ion above 0.8 mg/L
Sample pH should be between 3 and 4 to avoid developed color to fade or turbidity formation.