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NITRATE, LR,
13.
Press:
ZERO
The display will
count down to 0.
Then the display will
show 0.00 mg/L and
the zero prompt will
turn off.
continued
14.
Place the
prepared sample in
the cell holder.
Note: In bright sunlight,
it may be necessary to
close the cell
compartment cover.
50-38
15.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L nitrate as
nitrogen (NO
N).
-
3
Note: To convert the
results to mg/L NO
3
multiply by 4.4.
Note: Rinse the sample
cell immediately after
use to remove all
cadmium particles.
Note: Determine a
reagent blank for each
new lot of powder
pillows. Repeat Steps 4
to 14 using
demineralized water as
the sample. Subtract
this value from each
result obtained with the
new lot of reagent.
,
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