Nitrogen, Total
Nitrogen, Total
NitrogenTot_TNT_Other_PSD_Eng_Ody.fm Page 3 of 8
Blanks for Colorimetric Measurement
The reagent blank may be used up to seven days for measurements using the
same lots of reagents. Store it in the dark at room temperature (18–25 °C). If a
small amount of white floc appears prior to the end of one week, discard the
reagent blank and prepare a new one.
13. Touch the timer icon.
Touch
OK.
A two-minute reaction
period will begin.
14. After the timer beeps,
remove the caps from
two TN Reagent C vials
and add 2 mL of
digested, treated sample
to one vial. Add 2 mL of
digested, treated reagent
blank to the second TN
Reagent C vial.
15. Cap the vials and
invert ten times to mix.
Use slow, deliberate
inversions for complete
recovery. The tubes will
be warm.
16. Touch the timer icon.
Touch
OK.
A five-minute reaction
period will begin.
The yellow color will
intensify.
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:
0.0 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
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