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- Title
Nitrogen K-edge XANES – an overview of reference compounds used to identify `unknown' organic nitrogen in environmental samples.
- Authors
Leinweber, Peter; Kruse, Jens; Walley, Fran L.; Gillespie, Adam; Eckhardt, Kai-Uwe; Blyth, Robert I. R.; Regier, Tom
- Abstract
The chemical nature of soil organic nitrogen (N) is still poorly understood and one-third to one-half of it is typically classified as `unknown N'. Nitrogen K-edge XANES spectroscopy has been used to develop a systematic overview on spectral features of all major N functions in soil and environmental samples. The absolute calibration of the photon energy was completed using the 1 s→π* transitions of pure gas-phase N2. On this basis a library of spectral features is provided for mineral N, nitro N, amino acids, peptides, and substituted pyrroles, pyridines, imidazoles, pyrazoles, pyrazines, pyrimidines and purine bases. Although N XANES was previously considered `non-destructive', effects of radiation damage were shown for two compound classes and an approach was proposed to minimize it. This new evidence is integrated into a proposal for the evaluation spectra from environmental samples with unknown composition. Thus a basis is laid to develop N K-edge XANES as a complementary standard research method to study the molecular composition and ecological functions of `unknown N' in soil and the environment.
- Subjects
NITROGEN compounds; SPECTRUM analysis; PHOTONS; HETEROCYCLIC compounds; RADIATION injuries; SYNCHROTRON radiation; AMINO acids; PYRAZINES
- Publication
Journal of Synchrotron Radiation, 2007, Vol 14, Issue 6, p500
- ISSN
0909-0495
- Publication type
Other
- DOI
10.1107/S0909049507042513