Hach DR/850 Procedures Manual page 78

BROMINE,
continued
5. Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L Br2
Note: If Reagent Blank
Correction is on, the
display may flash "limit".
See Section 1.
9.
Press:
READ
The cursor will move to
the right, then the result
in mg/L bromine will
be displayed.
Note: If samples
temporarily turn yellow
after reagent addition, or
the display flashes "limit",
it is due to high bromine
levels. Dilute fresh samples
and repeat the test. A slight
loss of bromine may occur
during dilution. Multiply
results by the dilution
factor; see Section 1.
6.
Add the contents of
one DPD Total Chlorine
Powder Pillow to the
sample cell (the
prepared sample). Cap
the cell and swirl
vigorously to dissolve
the powder.
Note: It is not necessary
that all the powder
dissolves. A pink color will
develop if bromine is
present.
Note: Standard Adjust may
be performed using a
prepared standard
(see Section 1).
7.
Press:
TIMER
ENTER
A three-minute reaction
period will begin.
78
8.
When the timer
beeps, place the sample
into the cell holder.
Tightly cover the sample
cell with the instrument
cap.