19
INTERFERENCES
• Organic compounds like: chloramines, various aliphatic and aromatic amines, glycine, (positive
error).
To eliminate these interferences distillation is required.
• Organic compounds like: aldehydes, alcohols (e.g. ethanol) or acetone (negative error).
To eliminate these interferences distillation is required.
• Sulfide (S
2‑
): may cause turbidity.
• Hardness above 1 g/L as Calcium Carbonate (CaCO
3
).
•
At the end of measurement, the instrument directly displays concentration in mg/L of ammonium ion (NH
4
+
)
on the LCD. To convert the reading to mg/L of ammonia (NH
3
), multiply by the factor 0.944. To convert
the reading to mg/L of ammonia nitrogen (NH
3
‑N), multiply by the factor 0.776.
MEASUREMENT PROCEDURE