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ASTM E258-07(2015)

Current Revision

Standard Test Method for Total Nitrogen in Organic Materials by Modified Kjeldahl Method

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1.1 This test method covers the determination of total nitrogen in nitrogen-containing organic compounds. This test method is not applicable for use on materials containing N-O, N-N linkages.

1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.3  This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Note 1: Another method of restricted application is given in Test Method D1013.


4.1 This test method may be used to determine the total nitrogen content of certain unknown organic samples, or to assay known nitrogen containing organic compounds.

4.2 This test method may be used on organic materials in which the complete conversion of nitrogen to ammonium sulfate can be accomplished by digestion in a mixture of sulfuric acid, potassium sulfate, and mercuric oxide. It cannot be used on materials containing N–O, N–N linkages.

4.3 This test method assumes that ammonia can be quantitatively measured by distillation from an alkaline solution into a measured volume of standard acid.

SDO ASTM: ASTM International
Document Number E258
Publication Date June 1, 2015
Language en - English
Page Count 4
Revision Level 07(2015)
Supercedes
Committee D16.04
Publish Date Document Id Type View
June 1, 2015 E0258-07R15 Revision
April 1, 2007 E0258-07 Revision
Dec. 10, 2002 E0258-67R02 Reaffirmation
Jan. 1, 1996 E0258-67R96E01 Reaffirmation