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An improved procedure for 15N determination by emission spectrometry

✍ Scribed by Masayuki Ohmori; Hitoshi Iizumi; Akihiko Hattori

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
277 KB
Volume
111
Category
Article
ISSN
0003-2697

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✦ Synopsis

An improved method for emission spectrometric determination of 15N content with a small amount of nitrogen (2 pg, minimum) is described. Ammonium nitrogen and organic nitrogen are converted to N, gas by the method of Rittenberg and by the method of Dumas, respectively. The N, gas is purified, introduced into a MacLeod vacuum gauge for measuring the total quantity, and then an appropriate amount of the N, gas is collected in a discharge tube containing a molecular sieve 5A so as to give a gas pressure of about 5 TOIT. Emission is stable and reproducible, and 15N abundance can be determined with an error less than 0.01 and 0.10 atom% at a natural abundance level of 0.366 and at 9 atom%, respectively. Predetermination of N content of samples is not required.

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