HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Bremner, J. M. Articles by Edwards, A. P. Search for Related Content PubMed Articles by Bremner, J. M. Articles by Edwards, A. P. Agricola Articles by Bremner, J. M. Articles by Edwards, A. P.

Determination and Isotope-Ratio Analysis of Different Forms of Nitrogen in Soils: I. Apparatus and Procedure for Distillation and Determination of Ammonium¹

ABSTRACT

Methods of analysis have been developed which permit both determination and isotope-ratio analysis of inorganic and organic forms of nitrogen in soils and soil extracts. In each method, the form of nitrogen under analysis is converted to, and estimated as, ammonium, which is readily oxidized to nitrogen gas for mass spectrometer assay of N¹⁵. The ammonium is separated by steam distillation, collected in boric and acid-indicator solution, and determined by titration with standard acid. The apparatus and procedure used for distillation and determination of ammonium are described.

¹ Journal Paper no. J-4874 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Project no. 1070. This work was supported in part by the Tennessee Valley Authority and by a grant from the Rockefeller Foundation.

² Professor and Associate Professor in Soils, respectively.

Received for publication May 8, 1964. Accepted for publication May 4, 1965.