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APPLICATION:
RANGE:
MDL:
METHOD:
SAMPLE HANDLE &
PRESERVATION:
INTERFERENCES:
Ammonia Nitrogen, Low Range
Low concentrations of ammonia in fresh, brackish and salt
water; fresh and salt water aquariums.
0.00 - 1.00 ppm Ammonia-Nitrogen
0.05 ppm Fresh Water
0.10 ppm Salt Water
Salicylate and ammonia react at high pH in the presence of a
chlorine donor and an iron catalyst to form a blue indophenol
dye, the concentration of which is proportional to the
ammonia concentration in the sample.
Ammonia solutions tend to be unstable and should be
analyzed immediately. Samples may be stored for 24 hours at
4°C or 28 days at –20°C.
There are few interferences in most natural waters. High
concentrations of reducing agents, such as hydrazine,
react with the chlorine donor and can result in negative
interferences. Color and turbidity can also interfere.
COD3 Plus Colorimeter 10.16
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