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BARIUM,
continued
10.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.00 g/L and the
zero prompt will turn
off.
Note: This step adjusts
the DR/700 to the
calibration curve
previously entered.
11.
Place the
prepared sample 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.
45-4
12.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L barium.
Note: After each test,
clean the sample cell
with soap, water and a
brush. A white film of
barium sulfate will form
on the sample cell walls
and cause errors in
future determinations if
cleaning is not done
soon after each test.
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