Computer Science
Scientific paper
Sep 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..14..234j&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 14, Issue 3, pp.234-243
Computer Science
15
Scientific paper
The absolute abundance of the isotopes in atmospheric and commercial compressed N 2 from various sources has been determined. Nitrogen gas standards, prepared by mixing separated nitrogen isotopes in the form of (NH 4 ) 2 SO 4 solutions, were employed to calibrate two 60° sector mass spectrometers. As a result, the absolute ratio of N 14 /N 15 in atmospheric nitrogen was found to be 272.0 ± 0.3 Small variations from this value were found for commercial compressed gas. The mass spectrometric procedure used in determining the N 2 29+ / N 2 28+ ratio allowed for detection of differences to 1 part in 3500. However, the absolute accuracy of the abundance measurements was limited to 1 part in 1000 because of the semi-micro Kjedahl distillation employed to determine the amount of (NH 4 ) 2 SO 4 present in the solutions of the separated isotopes. In these measurements, instrumental background played a very significant role. A reliable method of correcting the observed N 2 29 / N 2 28+ ratio for the contribution of the background at these mass position was developed.
Junk Gregor
Svec Harry J.
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