Title

A High-Temperature Catalytic Oxidation Technique for Determining Total Dissolved Nitrogen

Abstract

A high-temperature catalytic oxidation method for determination of total dissolved N has been developed and tested on soil solution and throughfall. Unlike methods generally used for total dissolved N, this method is rapid, quantitative, and does not require use of strong acids or bases. The technique couples a commercially available chemiluminescent N detector with the combustion furnace of a commercially available C analyzer. An aqueous sample is combusted in an ultra pure oxygen environment at 680°C, converting all forms of N to nitric oxide, which then reacts with ozone. The product, metastable NO2, is measured chemiluminescently by the N detector. The method is appropriate for samples collected in studies of forest soil solution and throughfall, having a method detection limit of 0.03 mg L−1 total N, and a range from 0.03 to 10.0 mg L−1. Tests of several organic and inorganic N-containing compounds showed recoveries >90% for concentrations up to 5.0 mg N L−1. Urea was the only compound tested with recoveries

Publication Date

7-1996

Journal Title

Soil Science Society of America Journal

Publisher

Soil Science Society of America

Digital Object Identifier (DOI)

10.2136/sssaj1996.03615995006000040013x

Scientific Contribution Number

1934

Document Type

Article

Rights

Copyright © . Soil Science Society of America.