Hach DR/850, Procedures Manual, Page: 406 / 460

406
5.
Add the contents of
one SulfaVer 4 Sulfate
Reagent Powder Pillow
to the sample cell (the
prepared sample). Cap
the cell and invert
several times to mix.
Note: A white turbidity
will develop if sulfate is
present in the sample.
Note: Accuracy is not
affected by
undissolved powder.
6.
Press:
TIMER ENTER
A 5-minute reaction
period will begin.
Allow the cell to
stand undisturbed.
7.
After the timer
beeps, fill a second
sample cell with 10 mL
of sample (the blank).
8.
Place the blank into
the cell holder. Tightly
cover the sample cell
with the instrument cap.
9.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0 mg/L SO4
10.
Within five minutes
after the timer beeps,
place the prepared
sample into the cell
holder. Tightly cover the
sample cell with the
instrument cap.
11.
Press:
READ
The cursor will move to
the right, then the result
in mg/L sulfate will
be displayed.
Note: If Program 91 is
used, use of the Standard
Adjust is highly
recommended. See
Accuracy Check.
Note: Clean the sample
cells with soap and
a brush.
SULFATE,
continued