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ARSENIC,
16.
Fill a 25-mL cell
to the 25-mL line
with unreacted
arsenic absorber
solution (the blank).
Cap the cell.
19.
After 2 seconds,
the display will show
a program number,
concentration units,
and the zero prompt.
Press the
PROGRAM
key until the display
shows program
number
52.000
The upper display
will show the S1
concentration.
continued
17.
Install module
52.01
in a DR/700.
20.
Place the blank
in the cell holder.
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 a
10-mL sample cell and
proceed.
18.
The display will show
and module number
21.
The display will
count down to 0.
Then the display will
show the
concentration of the
standard and the zero
and standard prompts
will turn off.
52-24
Press:
I/O
525 nm
52.01
Press:
ZERO
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