Hach DR/700 Procedures Manual page 366

Colorimeter
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CADMIUM,
10.
Insert a pea-
sized cotton plug into
the delivery tube and
slowly drain the
bottom layer into a
dry 25-mL sample
cell (the prepared
sample). Cap.
Note: The cadmium-
dithizone complex is
stable for hours if the
sample cell is kept
tightly capped and out
of direct sunlight.
continued
11.
Fill a 25-mL cell
to the 25-mL line
with chloroform (the
blank). Cap.
52-40
12.
Place the blank
in the cell holder.
Note: If the display is
blank, repeat Steps 2
and 3.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
open. In bright
sunlight, it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
blank and 10 mL of the
sample to 10-mL sample
cells and proceed.

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