Hach DR2400 - Nitrate; Method 10020; Test N Tube Vials

DR/2400
Nitrate
Nitrate_TNT_High_CHA_Eng_Ody.fm Page 1 of 4
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water (nitrate-free) 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.
• This test is technique-sensitive. Invert the vials as described here to avoid low results: Hold the vial in a vertical position with the
cap pointing up. Turn the vial upside-down. Wait for all of the solution to flow down to the cap. Pause. Return the vial to an upright
position. Wait for all the solution to flow to the bottom of the vial. This process equals one inversion.
• 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.
Nitrate
Method 10020
Chromotropic Acid Method
Test ‘N Tube™ Vials
HR (0.2 to 30.0 mg/L NO
3
–
–N)
Scope and Application: For water and wastewater
1. Touch
Hach Programs.
Select program
344 N, Nitrate HR TNT.
Touch
Start.
2. Remove the cap from
a NitraVer X Reagent A
Test ‘N Tube vial and add
1.00 mL of sample (this is
the blank).
3. Cap the tube and
invert ten times to mix.
4. Install the 16-mm
adapter.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for installation details.
Insert the blank into the
adapter.
Tips and Techniques
Test ‘N Tube Method 10020
Hach Programs