NNANOCOLOR® Ammonium 50
Photometric determination of Ammonium
DDIN method: At a pH value of about 12.6 ammonium ions react with hypochlorite and salicylate in the presence of sodium nitroprussiate as catalyst to form a blue indophenol.
Good reproducibility is obtained for weakly polluted waters. Heavy pollution causes errors, unless a distillation precedes the analysis. Strongly acidic and buffered samples have to be adjusted to pH 9 – 10 for the test using sodium hydroxide solution.
Data and ordering information
REF 985 005
Type tube test 0-05
Range 1 – 40 mg/L NH4-N
1 – 50 mg/L NH4+
Sufficient for 20 determinations
Shelf life at least 1 year
Sea water suitability yes