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FLUORIDE,
10.
Place the
prepared sample in
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.
continued
11.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L fluoride (F
Note: If the instrument
flashes the upper range
limit, dilute the sample
with an equal volume of
demineralized water
and repeat the test,
using this solution in
Step 4. Multiply the
result by 2.
57-3
-
).
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