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土壤圈(英文版). 2001, (04)

An XPS Study of Nitrogen Structures in Soil Humic SubstancesEnglish Full Text

WEN QIXIAO, CHENG LILI and CHEN BIYUN 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 magic-angle 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 forms 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 benzoqu inone- （N H-4 ）-2 S O-4 polymer the XPS results deviated significantly from the 15N CPMAS NMR data.
Keywords：

distribution of N forms; 15N CPMAS NMR; soil humic substances; XPS.;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S153.62

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