| 中国黑土上腐殖酸和腐殖物质的提取及其描述 |
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| 作者姓名： | XING Bao-Shan LIU Ju-Dong LIU Xiao-Bing HAN Xiao-Zeng |
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| 作者单位： | [1]NortheastInstituteofGeographyandAgro-eeology,ChineseAcademyofSciences,Harbin150040China／／DepartmentofPlant,SoilandInsectSciences,UniversityofMassachusetts,MA01003USA [2]NortheastInstituteofGeographyandAgro-eeology,ChineseAcademyofSciences,Harbin150040China |
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| 基金项目： | *1Project supported in part by a grant from the Chinese Academy of Sciences for the Hundred Talents Program, the Federal Hatch Program, USA (No.MAS00860), and the United States-Israel Binational Agricultural Researchand Development Fund (No.IS-3385-03R). |
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| 摘 要： | Twenty-three progressive extractions were performed to study individual humic acids (HAs) and humin fractions from a typical black soil (Mollisol) in Heilongjiang Province, China using elemental analysis and spectroscopic techniques. After 23 HA extractions the residue was separated into high and low organic carbon humin fractions. HA yield was the highest for the first extraction and then gradually decreased with further extractions. Organic carbon (OC) of the humin fractions accounted for 58% of total OC even after 23 successive HA extractions. In addition, the atomic C/H ratio decreased during the course of extraction while C/O increased; the E4/E6 ratio from the UV analysis decreased with further extraction while E~/E3 increased; the band assigned to aliphatic carbon (2 930 cm-1) in the diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) spectra gradually increased with progressive extraction; the calculated ratio of the sum of aromatic carbon peak heights to that of aliphatic carbon peak heights from DRIFTS spectra declined with extractions; and nuclear magnetic resonance (NMR) data suggested that HA aliphatic carbons increased with extractions while aromatic carbons decreased. Thus, hydrophobicity and aliphaticity of HAs increased with extractions while polarity and aromaticity decreased. These data showed substantial chemical, structural, and molecular differences among the 23 HAs and two humin fractions. Therefore, these results may help explain why soil and sediment humin fractions have high sorption capacity for organic contaminants.
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| 关 键 词： | 土壤有机物 元素组成 腐殖酸 光谱特征 |
Extraction and characterization of humic acids and humin fractions from a black soil of China |
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| XING Bao-Shan,LIU Ju-Dong,LIU Xiao-Bing,HAN Xiao-Zeng.Extraction and characterization of humic acids and humin fractions from a black soil of China[J].Pedosphere,2005,15(1):1-8. |
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| Authors: | XING Bao-Shan LIU Ju-Dong LIU Xiao-Bing and HAN Xiao-Zeng |
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| Institution: | Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150040 (China). Email: bx@pssci.umass.edu;Department of Plant, Soil and Insect Sciences, University of Massachusetts, MA 01003 (USA);Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150040 (China). Email: bx@pssci.umass.edu;Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150040 (China). Email: bx@pssci.umass.edu;Department of Plant, Soil and Insect Sciences, University of Massachusetts, MA 01003 (USA);Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150040 (China). Email: bx@pssci.umass.edu |
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| Abstract: | Twenty-three progressive extractions were performed to study individual humic acids (HAs) and humin fractions from a typical black soil (Mollisol) in Heilongjiang Province, China using elemental analysis and spectroscopic techniques. After 23 HA extractions the residue was separated into high and low organic carbon humin fractions. HA yield was the highest for the first extraction and then gradually decreased with further extractions. Organic carbon (OC) of the humin fractions accounted for 58% of total OC even after 23 successive HA extractions. In addition, the atomic C/H ratio decreased during the course of extraction while C/O increased; the E4/E6 ratio from the UV analysis decreased with further extraction while E~/E3 increased; the band assigned to aliphatic carbon (2 930 cm-1) in the diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) spectra gradually increased with progressive extraction; the calculated ratio of the sum of aromatic carbon peak heights to that of aliphatic carbon peak heights from DRIFTS spectra declined with extractions; and nuclear magnetic resonance (NMR) data suggested that HA aliphatic carbons increased with extractions while aromatic carbons decreased. Thus, hydrophobicity and aliphaticity of HAs increased with extractions while polarity and aromaticity decreased. These data showed substantial chemical, structural, and molecular differences among the 23 HAs and two humin fractions. Therefore, these results may help explain why soil and sediment humin fractions have high sorption capacity for organic contaminants. |
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| Keywords: | elemental composition humic acid humin soil organic matter spectroscopic analysis |
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