Hach DR2400 Manual page 406

Nickel
5.
When the timer
beeps, add the contents of
one Nickel 2 Reagent
Powder Pillow to the
funnel. Stopper and
invert to mix.
9.
Touch the timer icon.
Touch .
OK
A third five-minute
reaction period will begin.
Invert the funnel several
times over the five minute
period.
Nickel
Page 2 of 6
6.
Touch the timer icon.
Touch .
OK
A second five-minute
reaction period will begin.
25 mL
20 mL
10 mL
10.
When the timer
beeps, wait for the layers
to separate. Insert a
pea-sized cotton plug
into the delivery tube of
the funnel. Remove the
stopper and drain the
chloroform layer (bottom
layer) into a sample cell.
(This is the prepared
sample.)
Stopper the funnel.
7.
When the timer
beeps, add 10 mL of
chloroform. Stopper and
invert gently. With the
funnel inverted and the
tip pointed away from
people, open the
stopcock to vent.
Repeat
Steps 7—10
11.
Repeat steps 7
through 10 two
additional times with
10-mL volumes of
chloroform. The
five-minute reaction
period is not necessary.
Stopper the funnel and
invert to mix. Wait for the
layers to separate, and
continue.
HRS MIN SEC HRS MIN SEC
8.
Close the stopcock
and invert for 30 seconds.
12.
Cap the sample cell
and invert to mix the
extracts. The final volume
will be about 25 mL due
to the slight solubility of
chloroform in water.
Nickel_PP_Other_HEP_Eng_Ody.fm