Explains TKN - EPA-821-R-01-004 January 2001 Method 1687...

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EPA-821-R-01-004 January 2001 Method 1687 Total Kjeldahl Nitrogen in Water and Biosolids by Automated Colorimetry with Preliminary Distillation/Digestion DRAFT January 2001 U.S. Environmental Protection Agency Office of Water Office of Science and Technology Engineering and Analysis Division (4303) 1200 Pennsylvania Ave. NW Washington, D.C. 20460
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Method 1687 ii Draft, January 2001 Acknowledgments This method was prepared under the direction of William A. Telliard of the U.S. Environmental Protection Agency's (EPA's) Office of Water. The method was prepared under EPA Contract 68-C-98-139 by DynCorp Information and Enterprise Technology. Disclaimer This draft method has been reviewed and approved for publication by the Analytical Methods Staff within the Engineering and Analysis Division of EPA. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. EPA plans further validation of this draft method. The method may be revised following validation to reflect results of the study. This method version contains minor editorial changes to the November 1999 version. EPA welcomes suggestions for improvement of this method. Suggestions and questions concerning this method or its application should be addressed to: Maria Gomez-Taylor Engineering and Analysis Division (4303) U.S. Environmental Protection Agency 1200 Pennsylvania Ave., NW Washington, DC 20460 Phone: (202) 260-7134 Fax: (202) 260-7185
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Method 1687 iii Draft, January 2001 Note: This method is performance based. The laboratory is permitted to omit any step or modify any procedure provided that all performance requirements in this method are met. The laboratory may not omit any quality control analyses. The terms "shall," "must," and “may not” define procedures required for producing reliable results. The terms "should" and "may" indicate optional steps that may be modified or omitted if the laboratory can demonstrate that the modified method produces results equivalent or superior to results produced by this method.
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1 Draft, January 2001 Method 1687 Total Kjeldahl Nitrogen in Water and Biosolids by Automated Colorimetry with Preliminary Distillation/Digestion 1.0 Scope and Application 1.1 This method describes procedures for the determination of total kjeldahl nitrogen (TKN) and/or organic nitrogen in drinking, ground, and surface water; domestic and industrial waste; and biosolids (municipal sewage sludge). Digestion/distillation of the TKN from the sample is followed by analysis using automated colorimetry. This method is based on U.S. Environmental Protection Agency (EPA) Method 351.1: Nitrogen, Kjeldahl (Colorimetric; Titrimetric; Potentiometric) (Reference 16.1). This method is associated with Method 1691: Municipal Biosolids Sampling Guidance (Reference 16.2). 1.2
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Explains TKN - EPA-821-R-01-004 January 2001 Method 1687...

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