Nitrate
Nitrate
Page 2 of 4
Nitrate_TNT_High_CHA_Eng_Ody.fm
Interferences
5. Touch Zero.
The display will show:
0.0 mg/L NO
3
–
–N
6. Remove the vial from
the instrument. Using a
funnel, add the contents
of one NitraVer X
Reagent B Powder Pillow
to the vial.
7. Cap and invert ten
times to mix (this is the
prepared sample).
Some solid matter will
not dissolve.
8. Touch the timer icon.
Touch
OK.
A five-minute reaction
period will begin. Do not
invert the vial again.
A yellow color will
develop if nitrate is
present.
9. Within five minutes
after the timer beeps,
wipe the prepared
sample and place it into
the cell holder.
10. Touch Read.
Results will appear in
mg/L NO
3
–
–N.
Interfering Substance Interference Levels and Treatments
Barium A negative interference at concentrations greater than 1 mg/L.
Chloride Does not interfere below 1000 mg/L.
Nitrite
A positive interference at concentrations greater than 12 mg/L. Remove nitrite interference up to
100 mg/L by adding 400 mg (one full 0.5 g Hach measuring spoon) of Urea (Cat. No. 11237-26)
to 10 mL of sample. Swirl to dissolve. Proceed with the nitrate test as usual.
Copper Positive at all levels.
Zero
Read
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