Pedosphere 11(4): 321--326, 2001
ISSN 1002-0160/CN 32-1315/P
©2001 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| An XPS study of nitrogen structures in soil humic substances |
| WEN Qi-Xiao, CHENG Li-Li and CHEN Bi-Yun |
| Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China) |
| ABSTRACT |
| X-ray photoelectron spectroscopy (XPS) was applied to examine the N structures of soil humic substances and some of their analogues. It was found that for soil humic substances XPS method gave similar results as those obtained by 15N CPMAS NMR (cross-polarization magicangle spinning nuclear magnetic resonance) method. 70%~86% of total N in soil humic substances was in the form of amide, and 6%~13% was presented as amines, with the remaining part as heterocyclic N. There was no difference in the distribution of the forma of N between the humic substances from soils formed over hundreds or thousands of years and the newly formed ones. For fulvic acid from weathered coal and benzoquinone-(NH4)2S04 polymer the XPS results deviated significantly from the 15N CPMAS NMR data. |
| Key Words: distribution of N forms, 15N CPMAS NMR, soil humic substances, XPS. |
| Citation: Wen, Q. X., Cheng, L. L. and Chen, B. Y. 2001. An XPS study of nitrogen structures in soil humic substances. Pedosphere. 11(4): 321-326. |
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