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ABSTRACT
In mass spectrometric procedures recently developed for determination of 15N-labeled dinitrogen (N2) and nitrous oxide (N2O) evolved from soils, calculations are performed to determine the mole fraction of 15N in the N pool from which this N2 or N2O was derived (15XN), and a fraction proportional to the amount evolved (d). The equations originally derived for these calculations are based on several approximations and are so simple that they can easily be performed using a handheld calculator. Modern ratio mass spectrometers are usually equipped with an on-line programmable calculator or computer to process the digital output from the integrating ratiometer, which has made it practical to calculate 15XN and d using equations based on fewer approximations than the equations previously derived. Refined versions of the equations are derived in this paper. The refined equations are much more complicated than the original equations, but they are more accurate and permit the use of fertilizers containing <20 atom % 15N in studies of denitrification.
1 This study was a part of Project no. ILLU-15-0392 of the Agric. Exp. Stn., College of Agriculture, Univ. of Illinois at Urbana-Champaign. It was supported in part by the Tennessee Valley Authority.
2 Assistant Professor and Associate Professor, respectively, Dep. of Agronomy, Univ. of Illinois, Urbana, IL 61801.
Received for publication June 12, 1985. Accepted for publication August 30, 1985.
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