| 固态13C和15N核磁共振法研究15N标记土壤的腐殖质组分 |
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| 引用本文： | CHENG Li-Li,WEN Qi-Xiao,CHEN Bi-Yun. 固态13C和15N核磁共振法研究15N标记土壤的腐殖质组分[J]. 土壤圈, 2001, 11(2): 151-157 |
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| 作者姓名： | CHENG Li-Li WEN Qi-Xiao CHEN Bi-Yun |
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| 作者单位： | InstituteofSoilScience,theChinsesAcademyofSciences,Nanjing210008（China） |
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| 基金项目： | *1Project (No.39790100) supported by the National Natural Science Foundation of China. |
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| 摘 要： | Five humic fractions were obtained from a uniformly ^15N-labelled soil by extraction with 0.1 mol L^-1 Na4P2O7,0.1mol L^-1 NaOH ,and HF/HCl-0.1 mol L^-1 NaOH,consecutively,and analyzed by ^13C and ^15N CPMAS NMR (cross polarization and magic angle spinning nuclear magnetic resonace).Compared with those of native soils humic fractions studied as a whole contained more alkyls ,methoxyls and O-alkyls,being 27%-36%,17%-21%and 36%-40%,respectively,but fewer aromatics and carboxyls(bein 14%-20% and 13%-90%,respectively),Among those humic fractions ,the humic acid(HA)and fulvic acid(FA) extracted by 0.1 mol L^-1 Na4P2O7 contained slightly more carboxyls than corresponding humic fractions extracted by 0.1 mol L^-1 NaOH ,and the HA extacted by 0.1 mol L^-1 NaOH after treatment with HF/HCl contained the least aromatics and carboxyls.The distribution of nitrogen functional groups of soil humic fractions studied was quite similar to each other and also quite similar to that of humic fraction from native soils.More than 75% of total N in each fraction was in amide from,with 9%-13% present as aromatic and /or aliphatic amines and the remainder as heerocyclic N.
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| 关 键 词： | 芳香族化合物 氮 碳 腐殖质 赋存形态 土壤成分 交叉偏振幻角自核磁共振 |
Characterization of humic fractions in a 15N-labelled soil by solid-state 13C and 15N NMR |
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| CHENG Li-Li,WEN Qi-Xiao and CHEN Bi-Yun. Characterization of humic fractions in a 15N-labelled soil by solid-state 13C and 15N NMR[J]. Pedosphere, 2001, 11(2): 151-157 |
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| Authors: | CHENG Li-Li WEN Qi-Xiao CHEN Bi-Yun |
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| Affiliation: | Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China);Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China);Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China) |
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| Abstract: | Five humic fractions were obtained from a uniformly ^15N-labelled soil by extraction with 0.1 mol L^-1 Na4P2O7,0.1mol L^-1 NaOH ,and HF/HCl-0.1 mol L^-1 NaOH,consecutively,and analyzed by ^13C and ^15N CPMAS NMR (cross polarization and magic angle spinning nuclear magnetic resonace).Compared with those of native soils humic fractions studied as a whole contained more alkyls ,methoxyls and O-alkyls,being 27%-36%,17%-21%and 36%-40%,respectively,but fewer aromatics and carboxyls(bein 14%-20% and 13%-90%,respectively),Among those humic fractions ,the humic acid(HA)and fulvic acid(FA) extracted by 0.1 mol L^-1 Na4P2O7 contained slightly more carboxyls than corresponding humic fractions extracted by 0.1 mol L^-1 NaOH ,and the HA extacted by 0.1 mol L^-1 NaOH after treatment with HF/HCl contained the least aromatics and carboxyls.The distribution of nitrogen functional groups of soil humic fractions studied was quite similar to each other and also quite similar to that of humic fraction from native soils.More than 75% of total N in each fraction was in amide from,with 9%-13% present as aromatic and /or aliphatic amines and the remainder as heerocyclic N. |
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| Keywords: | aromaticity 13C CPMAS NMR humic substances 15N CPMAS NMR nitrogen forms |
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