Hach DR/850, Procedures Manual, Page: 243 / 460

243
Method 8192
NITRATE, Low Range
(0 to 0.50 mg/L NO
3
-
-N)
For water, wastewater and seawater
*
Cadmium Reduction Method
* Seawater requires a manual calibration; see Interferences.
1.
Enter the stored
program number for low
range nitrate nitrogen
(NO
3
-
-N).
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:
55 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 25-mL
graduated mixing
cylinder to the 15-mL
mark with sample.
Note: Adjust the pH of
stored samples before
analysis.
4.
Add the contents of
one NitraVer 6 Nitrate
Reagent Powder Pillow
to the cylinder. Stopper.
Note: It is necessary to
remove all the powder from
the foil pillow. Tap the
pillow until no more
powder pours out. Be sure
to remove powder from the
corners of the pillow.