ORBECO SP600, Instruction Manual, Page: 181 / 334

179
SP600 Spectrophotometer 01/2008
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 improbable in practice that theses 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