Record Display for the EPA National Library Catalog


Main Title Nitrate interference in total kjeldahl nitrogen determinations and its removal by anion exchange resins /
Author Schlueter, Albert. ; Schleuter., Albert
CORP Author Central State Univ., Wilberforce, Ohio. Dept. of Chemistry.;Environmental Monitoring and Support Lab.-Cincinnati, Ohio.
Publisher Environmental Monitoring and Support Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1977
Report Number EPA-600/7-77-017; EPA-R-802755-02
Stock Number PB-267 285
OCLC Number 27243526
Additional Subjects Water analysis ; Nitrogen ; Water pollution ; Infrared spectroscopy ; Concentration(Composition) ; Organic nitrates ; Ion exchange resins ; Temperature ; Sediments ; Water quality ; Microorganisms ; Electrodes ; Anions ; Nitrogen organic compounds ; Chemical analysis ; Experimental design ; Ammonia ; Kjeldahl method ; Procedures ; Water pollution detection ; Solid wastes
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-7-77-017 Headquarters Library/Washington,DC 09/12/2011
EJBD  EPA 600-7-77-017 c.1 Headquarters Library/Washington,DC 02/12/2014
EKBD  EPA-600/7-77-017 Research Triangle Park Library/RTP, NC 08/11/2000
ESAD  EPA 600-7-77-017 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-267 285 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation vii, 17 p. : ill. ; 28 cm.
The standard methods for analysis of water and waste samples are under continual review to assure that the most accurate results possible are obtained. If a chemical interference in an important analytical procedure is discovered it must be evaluated and if necessary a procedure modification made to circumvent the interference. The interference of nitrate with the determination of total Kjeldahl nitrogen (TKN) was investigated. TKN losses of greater than 90% were observed in solutions containing a nitrate-nitrogen concentration ten times the TKN level. The loss was found by infrared spectroscopy to be occurring due to nitrate and ammonia decomposition to nitrous oxide at the elevated TKN digestion temperatures. Prevention of the nitrate interference in TKN analyses was found to be possible only by removal of nitrate prior to TKN analysis. Several anion-exchange resins in the chloride form were found effective in this removal. Samples containing known TKN levels and high nitrate concentration when treated by these resins prior to TKN analysis gave nearly 100% TKN recovery on TKN analysis.