Nitrogen, Ammonia; Nessler Method - Hach DR2400 Manual

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Table of Contents

Scope and Application:

and seawater; USEPA accepted for wastewater analysis (distillation required); see Distillation following this

* Adapted from Standard Methods for the Examination of Water and Wastewater 4500-NH

Tips and Techniques

• 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

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.)

Hach Programs

Hach Programs

Select program

380 N, Ammonia, Ness.

NitrogenAmm_None_Other_NES_Eng_Ody.fm

For water, wastewater, and seawater; distillation is required for wastewater

Fill a 25-mL mixing

graduated cylinder to the

25-mL mark with sample

(this is the prepared

Nitrogen, Ammonia

(0.02 to 2.50 mg/L NH

Fill a 25-mL mixing

graduated cylinder to the

25-mL mark with

deionized water (this is

Add three drops

of Mineral Stabilizer to

each cylinder.

Stopper and invert several

times to mix.

Nitrogen, Ammonia