DR/2400
Nitrogen, Ammonia
NitrogenAmm_None_Other_NES_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.
• Nessler Reagent is toxic and corrosive. Pipet carefully, using a pipet filler.
• When dispensing reagent from a dropper bottle, hold the bottle vertically. Do not hold the bottle at an angle.
• Nessler Reagent contains mercuric iodide. Both the sample and the blank will contain mercury (D009) at a concentration
regulated as a hazardous waste by the Federal RCRA. Do not pour these solutions down the drain. See Section 4 for further
information on proper disposal of these materials.
• If using the Flow Cell, periodically clean the cells by pouring a few sodium thiosulfate pentahydrate crystals into the cell funnel.
Flush with enough deionized water to dissolve. Rinse the cell thoroughly.
• A yellow color will develop if ammonia is present. (The reagent will cause a faint yellow color in the blank.)
Nitrogen, Ammonia
(Method 8038
Nessler Method*
*Adapted from Standard Methods for the Examination of Water and Wastewater 4500-NH
3
B & C.
(0.02 to 2.50 mg/L NH
3
–N)
Scope and Application: For water, wastewater, and seawater; distillation is required for wastewater
and seawater; USEPA accepted for wastewater analysis (distillation required); see Distillation following this
procedure.
1. Touch
Hach Programs.
Select program
380 N, Ammonia, Ness.
Touch Start.
2. Fill a 25-mL mixing
graduated cylinder to the
25-mL mark with sample
(this is the prepared
sample).
3. Fill a 25-mL mixing
graduated cylinder to the
25-mL mark with
deionized water (this is
the blank).
4. Add three drops
of Mineral Stabilizer to
each cylinder.
Stopper and invert several
times to mix.
Tips and Techniques
10 mL
Method 8038
Hach Programs
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