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- W2391461559 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." @default.
- W2391461559 created "2016-06-24" @default.
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- W2391461559 date "2001-01-01" @default.
- W2391461559 modified "2023-09-27" @default.
- W2391461559 title "An XPS Study of Nitrogen Structures in Soil Humic Substances" @default.
- W2391461559 hasPublicationYear "2001" @default.
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