LaMotte 1200 COLORIMETER AMMONIA-NITROGEN - Manual (Page 4)

FOR EXAMPLE:
A fresh water sample at 20°C has a pH of 8.5 and the test result is 1.0 ppm as total
Ammonia-Nitrogen.
1.
The percentage from the table is 11.18% (or 0.1118).
2. 1 ppm total Ammonia-Nitrogen x 0.1118 = 0.1118 ppm Unionized
Ammonia-Nitrogen
3. Total Ammonia-Nitrogen 1.0000 ppm
Unionized Ammonia-Nitrogen - 0.1118 ppm
Ionized Ammonia-Nitrogen = 0.8882 ppm
AMMONIA NITROGEN
TEST METHOD SPECIFICATIONS
APPLICATION
Drinking , surface, and saline waters; domestic and industrial wastes.
RANGE
0 to 5.0 ppm Ammonia Nitrogen
METHOD
Ammonia forms a colored complex with Nessler’s Reagent in proportion to the amount
of ammonia present in the sample. Rochelle salt is added to prevent precipitation of
calcium or magnesium in undistilled samples.
HANDLING & PRESERVATION
Preservation is accomplished by the addition of 2 mL of concentrated H
2
SO
4
at 4°C.
INTERFERENCES
Sample turbidity and color may interfere. Turbidity may be removed by a filtration
procedure. Color interference may be eliminated by adjusting the instrument to 100%T
with a sample blank.
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