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METHOD PROCEDURE
Note: For wastewater or seawater samples, before performing measurements,
distillation is required.
INTERFERENCES
Interference may be caused by:
• Alkalinity above 5000 mg/L CaCO
3
• Chloride above 700 mg/L
• Sulfate above 200 mg/L
• Orthophosphate above 16 mg/L
• Aluminum above 0.1 mg/L
• Iron (Ferric) above 10 mg/L
• Sodium hexametaphosphate above 1.0 mg/L
• Highly-colored and turbid samples may require distillation
• Highly-alkaline samples can be neutralized with nitric acid
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