Nitrogen, Ammonium
Nitrogen, Ammonium
Page 2 of 4
NitrogenAmm_UniCell_SAL_Eng_Ody.fm
Interferences
The ions listed in the following table have been individually tested up to the
given concentrations. Cumulative effects and the influence of other ions have
not been evaluated.
Sample, Collection, Storage, and Preservation
Analyze samples within 3 hours after collection for best results. Collect samples
in clean plastic or glass bottles. To preserve samples for longer periods, add 1 mL
of concentrated sulfuric acid per liter and store at 4 °C.
Warm the sample to room temperature before testing. Adjust the pH to 4–9 with
5.0 N Sodium Hydroxide. Do not use mercury compounds as preservatives.
Correct the test results for volume additions by dividing the total final volume
(acid + base + sample) by the initial sample volume and multiplying the result
by this factor. See Section 3.1.3 Correcting for Volume Additions on page 29.
5. Touch the timer icon.
Touch
OK.
A 15-minute reaction
period will begin.
6. Install the 16-mm cell
adapter.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for adapter installation
details.
Wipe the zero (white cap)
and sample vials and
place the zero vial into the
cell adapter.
7. Touch Zero.
The display will show:
0.0 mg/L NH
4
+
Underrange
8. When the timer
beeps, place the sample
vial into the cell adapter.
Touch
Read.
Results will appear in
mg/L NH
4
+
.
HRS MIN SECHRS MIN SEC
Zero
Interfering Substance No interference up to:
Cl
–
, SO
4
2–
1000 mg/L
K
+
, Na
+
, Ca
2+
500 mg/L
CO
3
2–
, NO
3
–
, Fe
3+
, Cr
6+
, Zn
2+
, Cu
2+
, Co
2+
, Ni
2+
, Hg
2+
50 mg/L
Fe
2+
25 mg/L
Sn
2+
10 mg/L
Pb
2+
5 mg/L
Ag
+
2 mg/L
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