Hach DR/700 Procedures Manual page 175

BARIUM,
continued
7.
Add the contents
of one BariVer 4
Barium Reagent
Powder Pillow to
each sample cell.
Cap and invert several
times to mix.
Note: A white turbidity
will develop if barium is
present.
Note: If the BariVer 4
Reagent does not
dissolve readily, use a
25-mL graduated
mixing cylinder. Mix
the reagent with the
sample in the cylinder,
then pour it into the
sample cell.
5 minutes
8.
Wait 5 minutes.
Note: The sample
should not be disturbed
during the five minute
turbidity development
period.
45-3
9.
Within 5 minutes
after the 5 minute
period, place the
treated standard in the
cell holder.
Note: If the display is
blank, repeat Steps 2
and 3.
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.