NEMI Method Summary


Method Summary Information

Method Number:

D5176

Media:

WATER

Revision:

Reapproved 1995. Current edition approved Sept. 15, 1991. Published February 1992.

Method Source:

ASTM International

Subcategory:

ORGANIC

Analytes in this method

Official Name:

Standard Test Method for Total Chemically Bound Nitrogen in Water by Pyrolysis and Chemiluminescence Detection

Descriptive Name

Nitrogen, Chemically Bound, in Water

Source Info:

ASTM International
100 Barr Harbor Drive West
Conshohocken, PA 19428
Telephone: (610) 832-9500
Fax: (610) 832-9555
Email: service@astm.org

Citation:

ASTM Volume 11.02

Brief Method
Summary:

The sample of water is introduced into a stream of oxygen or inert gas/oxygen mix flowing through a quartz pyrolysis tube. Oxidative pyrolysis converts chemically bound nitrogen to nitric oxide (NO). The gas stream is dried and the NO is contacted with ozone (O₃) producing metastable nitrogen dioxide (NO₂^*). As the NO₂^* decays, light is emitted and detected by a photomultiplier tube. The resulting signal is a measure of the total chemically bound nitrogen in the sample.

Scope And
Application:

This test method covers the determination of the total nitrogen content of water in concentrations from 0.5 to 1000 mg/L. Higher nitrogen concentrations may be determined by making the proper dilutions. This test method does not determine molecular nitrogen (N2).

Applicable
Conc Range:

0.5-1000 mg/L

Interferences:

If water samples contain high concentrations of suspended matter or dissolved nonvolatile compounds, the syringe needle may tend to plug or the precision and bias of the test method may be degraded. In such a case, the sample boat system should be used .

QC Requirements:

Sample Handling:

Max Holding Time:

Relative Cost:

$51 to $200

URL to obtain ordering information for this method:

http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/PAGES/D5176.htm?E+mystore

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Method Summary Information