22
METHOD PROCEDURE
• Press the
key and use the functional keys to select
Chemical Form
.
• Use the functional keys and press
Select
to change the displayed chemical formula
to
mg/L
of
ammonia (NH
3
)
and
ammonium (NH
4
+
).
INTERFERENCES
Interference may be caused by:
• Hardness above 1 g/L
• Iron
• Sulfide may cause turbidity
• Organic compounds like acetone above 0.1%, alcohols, aldehydes, aliphatic and
aromatic amines, chloramines, glycine, or urea above 10 mg/L, to remove the
interference distillation is required