Abstract
A combination of nitrogen isotope analysis and X-ray photoelectron spectroscopy techniques was used to characterize nitrogen isotopic compositions and organic nitrogen forms in a total of 11 coal samples from China. A range of δ15N values between −2.9‰ and +3.6‰ was observed in all coals, and the N-5 peak is predominant. The results show that a correlation exists between the δ15N value and the proportions of the N-5 peak and the sum of the N-6 and N-Q peaks. This suggests that the nitrogen isotopic composition of coal may be controlled by the distribution of nitrogen forms. The pyridinic-structure nitrogen is enriched in 15N compared with the pyrrolic-structure nitrogen.
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