Nitrogen, Total
Nitrogen, Total
NitrogenTot_TNT_High_PSD_Eng_Ody.fm Page 3 of 6
Blanks for Colorimetric Measurement
The reagent blank may be used repeatedly for measurements using the same lots
of reagents. Store the reagent blank in the dark at room temperature (18–25 °C)
for a maximum of seven days. If a small amount of white floc appears prior to
the end of one week, discard the reagent blank and prepare a new one.
Interferences
The substances in Table 1 have been tested and found not to interfere up to the
indicated levels (in mg/L). Interfering substances that resulted in a
concentration change of ±10% appear in Table 2 .
17. Install the 16-mm
adapter.
Note: See Section 2.6 in the
Instrument Manual for
installation details.
Wipe the reagent blank
and place it into the
adapter.
18. Touch Zero.
The display will show:
0 mg/L N
19. Wipe the reagent vial
and place it into the
adapter.
20. Touch Read.
Results will appear in
mg/L N.
Zero
Read
Table 1 Non-interfering Substances
Substance Maximum Level Tested
Barium 10.4 mg/L
Calcium 1200 mg/L
Chromium (
3+
)2 mg/L
Iron 8 mg/L
Lead 26.4 µg/L
Magnesium 2000 mg/L
Organic Carbon 600 mg/L
pH 13 pH units
Phosphorus 400 mg/L
Silica 600 mg/L
Silver 3.6 mg/L
Tin 6 mg/L
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