Hach DR/850, Procedures Manual, Page: 235 / 460

235
Method 8039
NITRATE, High Range
(0 to 30.0 mg/L NO
3
-
-N)
For water, wastewater, and seawater
*
Cadmium Reduction Method
(Using Powder Pillows or AccuVac Ampuls)
Using Powder Pillows
* Seawater requires a manual calibration; see Interferences.
1.
Enter the stored
program number for
high range nitrate
nitrogen (NO
3
¯–N)
powder pillows.
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
2.
Press:
51 ENTER
The display will show
mg/L, NO3-N and the
ZERO icon .
Note: For alternate forms
(NO
3
), press the
CONC key.
3.
Fill a sample cell
with 10 mL of sample.
Note: Adjust the pH of
stored samples before
analysis.
4.
Add the contents of
one NitraVer 5 Nitrate
Reagent Powder Pillow
to the sample cell (the
prepared sample). Cap
the sample cell.
Note: It is important to
remove all of the powder
from the foil pillow. Tap the
pillow until no more
powder pours out.