238
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, 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 and
neutralize with 5.0 N Sodium Hydroxide Standard Solution.
Do not use mercury compounds as preservatives.
Correct the test result for volume additions; see Correction for
Volume Additions (Section 1) for more information.
9.
Place the AccuVac
Ampul into the cell
holder. Tightly cover the
ampul with the
instrument cap.
10. Press: READ
The cursor will move to
the right, then the result
in mg/L NO
3
-N (or
alternate form) will
be displayed.
Note: Use of the Standard
Adjust feature for each new
lot of reagent is highly
recommended. See Accuracy
Check.
Note: See Pollution
Prevention and Waste
Management for proper
disposal of cadmium.
NITRATE, High Range, continued
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