LaMotte SMART Spectro Spectrophotometer User Manual
Page 67
APPLICATION:
Low concentrations of ammonia in fresh, brackish and salt
water; fresh and salt water aquariums.
RANGE:
0.00–1.00 ppm Ammonia-Nitrogen
MDL:
0.02 ppm Fresh Waer
0.10 ppm Salt Water
METHOD:
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.
SAMPLE HANDLE &
PRESERVATION:
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.
INTERFERENCES:
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.
AMMONIA-NITROGEN, Low Range
SMART Spectro Test Procedures 2.11
Test P
rocedures