Hach DR2400 - Page 510

Nitrogen, Total
Nitrogen, Total
Page 2 of 6
NitrogenTot_UniCell_Other_PSD_Eng_Ody.fm
5. Heat the reaction tube
in the reactor block at
100 °C for 60 minutes.
6. After the heating
period, remove the tube
from the reactor block
and place it in a cooling
rack.
7. When the reaction
tube has cooled to room
temperature, add a
colorless MicroCap C
(HCT 111 C) and cap the
tube.
8. Invert the tube
several times until the
solid material in the cap
is fully dissolved.
9. Pipet 0.2 mL of
Dimethylphenol Solution
D (HCT 111 D) into a
sample vial (blue cap).
10. Cap the vial and
invert three times to mix.
11. Immediately pipet
1.0 mL of digested
sample from the reaction
tube into the sample vial.
12. Cap the sample vial
and invert it several times
until the reagents are
mixed and appear
uniform.
13. Touch the timer icon.
A 15-minute reaction
period will begin.
14. Wipe the outside of
the zero vial (white cap)
and the sample vial with
a damp towel followed
with a dry one to remove
fingerprints and other
marks.
15. Install the 16-mm
adapter.
Note: See Section 2.6 in the
Instrument Manual for
installation details.
When the timer beeps,
place the zero vial (white
cap) into the cell holder.
16. Touch Zero.
The display will show:
0.00 mg/L N
Zero