An XPS Study of Nitrogen Structures in Soil Humic Substances

作     者：WEN QIXIAO, CHENG LILI and CHEN BIYUN Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China) WEN QIXIAO, CHENG LILI and CHEN BIYUN Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)

作者机构：中科院南京土壤所 江苏 南京 210008 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2001年第11卷第4期

页      面：321-326页

核心收录：

学科分类：0818[工学-地质资源与地质工程] 09[农学] 0903[农学-农业资源与环境] 0901[农学-作物学] 090301[农学-土壤学] 

基　　金：Project (No. 39790100) supported by the National Natural Science Foundation of China 

主　　题：distribution of N forms 15N CPMAS NMR soil humic substances XPS. 

摘      要：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.