1.1 Methods
Notes:
1. The following ions can produce interferences since under the reaction conditions
they cause precipitation:
Antimony (III), Iron (III), Lead, Mercury (I), Silver, Chloroplatinate, Metavanadate and
Bismuth.
Copper (II)-ions may cause lower test results as they accelerate the decomposition of
the Diazonium salt.
It is unlikely in practice that these interfering ions will occur in such high concentrations
that they cause significant reading errors.
2. Conversion:
mg/l NO
2
= mg/l N x 3.29
3.
N
NO
2
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