NEMI Method Summary


Method Summary Information

Method Number:

I-5553

Media:

SOILS/SEDIMENT

Revision:

Oct-90

Method Source:

U.S. Geological Survey (USGS)

Subcategory:

INORGANIC

Analytes in this method

Official Name:

Nitrogen, ammonia plus organic, titrimetric, digestion-distillation

Descriptive Name

Nitrogen, ammonia plus organic, total-in-bottom-material, dry wt, titration

Source Info:

USGS Branch of Information Services
Box 25286, MS 417
Federal Center
Denver, CO 80225-0286
Phone: 303-202-4700

Citation:

U.S. Geological Survey Open-File Report 93-125

103511

Byte file

Brief Method
Summary:

The sample is subjected to a digestion whereby all organic nitrogen-containing compounds are converted to ammonium salts. The resulting mixture is then made strongly alkaline, and the ammonia so formed is distilled from the mixture into a solution of boric acid and subsequently determined by titration with standard sulfuric acid solution.

Scope And
Application:

This method may be used for analysis of bottom material containing at least 10 mg/kg of total ammonia plus organic nitrogen. Only that portion of bottom material that passes a 2-mm sieve is taken for analysis (method P-0810, sub-sampling, bottom material, coring).

Applicable
Conc Range:

Interferences:

There are no known interferences with this method.

QC Requirements:

Standardize sulfuric acid titrant with sodium carbonate primary standard solution

Sample Handling:

Container Description: 500 mL polypropylene bottle, wide mouth.
Treatment and Handling: Chill and maintain 4 degrees C and ship immediately.

Max Holding Time:

30 days

Relative Cost:

Less than $50

5506

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Method Summary Information