Hach DR/700 - Page 227

45-55
SULFATE, continued
7. Add the contents
of one SulfaVer 4
Sulfate Reagent
Powder Pillow to
each sample cell.
Cap and invert several
times to mix.
Note: A white turbidity
will develop if sulfate is
present.
Note: Accuracy is not
affected by undissolved
powder.
8. Wait 5 minutes.
Note: Allow cells to
stand undisturbed.
Note: Perform Steps 9-
12 within 5 minutes
after the 5-minute
waiting period.
9. Place the prepared
standard into the cell
holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
Note: If the display is
blank, repeat Steps 2
and 3.
10. Press: ZERO
The display will
count down to 0.
Then the display will
show the standards
concentration and the
zero prompt will turn
off.
11. Place the
prepared sample in
the cell holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
12. Within 5
minutes after the 5-
minute period, press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L sulfate (SO
4
2-
).
Note: Clean the sample
cells with soap and a
brush.
5 minutes