Hach DR2400 Manual page 684

Phosphorus, Total
5.
Place the vial into the
Reactor Block. Heat at
100 °C for 60 minutes.
9.
Invert the sample vial
repeatedly until the solid
reagent in the cap is
dissolved.
Zero
13.
Touch .
Zero
The display will show:
3–
0.0 mg/L PO
4
Underrange
Phosphorus, Total
Page 2 of 6
6.
After the 60-minute
heating period, carefully
remove the hot vial from
the reactor. Place it in a
tube rack and cool to room
temperature (15–25 °C).
HRS MIN SEC HRS MIN SEC
10.
Touch the timer icon.
Touch .
OK
A 10-minute reaction
period will begin.
14.
Place the prepared
sample vial into the cell
adapter.
7.
Pipet 0.5 mL of
Reagent B (HCT 121/
122 B) into the cooled
sample vial.
Close the Reagent B bottle
immediately after use.
11.
Wipe the outside of
the zero (white cap) and
sample vials with a damp
cloth followed by a dry
one, to remove finger-
prints or other marks.
Read
15.
Touch .
Read
Results will appear in
3–
mg/L PO .
4
PhosphorusTot_UniCell_Other_APD_Eng_Ody.fm
8.
Screw a grey
UniCap C (HCT 122 C)
onto the sample vial.
12.
Install the 16-mm cell
adapter.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for adapter installation
details.
When the timer beeps,
place the zero vial into the
cell adapter.