Hach DR2400 - Nitrate; Method 8039; Powder Pillows or Accuvac

DR/2400
Nitrate
Nitrate_AVPP_HR_CDR_Eng_Ody.fm Page 1 of 6
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust. See the
instrument manual for more information on Running a Reagent Blank.
• A deposit of unoxidized metal will remain after the NitraVer
®
5 dissolves. The deposit will not affect results.
• This method is technique-sensitive. Shaking time and technique influence color development. For most accurate results, make
successive tests on a 10-mg/L Nitrate Nitrogen Standard solution. Adjust shaking time and technique to obtain the correct result.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• Rinse the sample cell immediately after use to remove all cadmium particles. Prepared samples will contain cadmium and must
be disposed of according to Federal, State and local hazardous waste regulations. For information on pollution prevention and
waste management, refer to Section 4 on page 55.
Nitrate
Method 8039
Cadmium Reduction Method
Powder Pillows or AccuVac
®
Ampuls
HR (0.3 to 30.0 mg/L NO
3
–
–N)
Scope and Application: For water, wastewater, and seawater.
1. Touch
Hach Programs.
Select program
355 N, Nitrate HR.
Touch
Start.
2. Fill a round sample
cell with 10 mL of
sample.
3. Add the contents of
one NitraVer 5 Nitrate
Reagent Powder Pillow.
Cap (this is the prepared
sample).
4. Touch the timer icon.
Touch
OK.
A one-minute reaction
period will begin. Shake
the cell vigorously until
the timer beeps.
Tips and Techniques
Powder Pillows Method 8039
Hach Programs