Hanna Instruments HI83300 Instruction Manual page 90

Note: For wastewater or seawater samples, before performing measurements, distillation is
required.
INTERFERENCES
Interferences may be caused by:
Alkalinity (as CaCO
Aluminum above 0.1 mg/L
Iron, ferric above 10 mg/L
Chloride above 700 mg/L
ortho‑Phosphate 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.
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) above 5000 mg/L
3