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NITRATE, HR,
10.
Place the
AccuVac Vial
Adapter into the cell
holder.
SAMPLING AND STORAGE
Collect samples in clean plastic or glass bottles. Store at 4 °C (39 °F) or
lower if the sample is to be analyzed within 24 to 48 hours. Warm to
room temperature before running the test. For longer storage periods, up
to 14 days, adjust sample pH to 2 or less with sulfuric acid, ACS, (about
2 mL per liter). Sample refrigeration is still required.
Before testing the stored sample, warm to room temperature. Neutralize
the sample with 5.0 N Sodium Hydroxide Standard Solution. Do not
use mercury compounds as preservatives. Correct test results for
volume additions; see Sampling and Storage, Volume Additions,
(Section I) for more information.
continued
11.
Place the
prepared sample in
the cell holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
50-31
12.
Press:
READ
The display will
count down to 0.
Then the display will
show the results in
mg/L nitrate as
nitrogen.
Note: Determine a
reagent blank for each
new lot of NitraVer 5
ampuls. Repeat Steps 4 -
12, using demineralized
water as the sample.
Subtract this value from
each result obtained with
each lot of reagent.
Note: To convert the
results to mg/L nitrate
-
(NO
) multiply by 4.4
3
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