Hach DR/700 Procedures Manual page 242

LEAD,
continued
19.
Replace the
sample cell in the cell
holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
sunlight it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
blank solution to a 10-
mL cell. If the
10-mL cell is used for
the blank, another
10-mL cell must be used
for the sample.
20.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
µg/L lead (Pb).
Note: Running a
reagent blank with lead-
free, reagent grade
water is required for
USEPA reporting
purposes. Each new lot
of reagents should have
a reagent blank
determined. The
reagent blank is then
subtracted from each
test result.
48-6