Hach DR/700 Procedures Manual page 241

LEAD,
continued
16.
Place the sample
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.
17.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.00 µg/L and
the zero prompt will
turn off.
48-5
18.
Remove the
sample cell from the
cell holder and add 6
drops of pPb-6
Decolorizer Solution
to the cell. Cap and
invert several times to
mix.
Note: There will be little
visual difference
between the blank and
the sample.