Characterization and dynamics of organic compounds in forest humus studied by pyrolysis-gas chromatography (electron impact mass spectrometry and pyrolysis-(high-resolution) field ionization mass spectrometry
Characterization and dynamics of organic compounds in forest humus studied by pyrolysis-gas chromatography (electron impact mass spectrometry and pyrolysis-(high-resolution) field ionization mass spectrometry
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通过热解-气相色谱（电子轰击质谱和热解-（高分辨率）场电离质谱）研究森林腐殖质中有机化合物的表征和动态
DOI：
10.1016/0165-2370(88)80015-9
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发表时间：
1988
影响因子：
6
通讯作者：
H. Schulten
中科院分区：
文献类型：
--
作者：
R. Hempfling;H. Schulten
对三种森林腐殖质类型（mull、moder、mor）宏观形态差异层的研究证明了热解质谱法适用于表征、区分和识别不同腐殖化阶段腐殖质土壤层中的有机化合物。除了低分子热解产物外，高分辨率热解-场电离质谱和热解-气相色谱/电子轰击质谱的结合还能够表征森林腐殖质中无法用湿化学方法解释的较高分子亚基。因此，与湿化学描述的化合物相比，可以显示出对结合的长链脂肪酸和缩合木质素二聚体的更高的生物降解性。腐殖质的质谱显示黄腐酸、腐殖酸和胡敏素之间存在显着差异。计算机构建的这三个组分的总谱与原始样品的谱显着不同，表明样品制备过程中的化学变化和选择性损失。
The study of macromorphologically differentiated horizons from three forest humus types (mull, moder, mor) demonstrated the suitability of pyrolysis-mass spectrometry to characterize, differentiate and identify organic compounds in humic soil horizons at different stages of humification. Besides lower molecular pyrolysis products the combination of high-resolution pyrolysis-field ionization mass spectrometry and pyrolysis-gas chromatography/electron impact mass spectrometry also enabled the characterization of higher molecular subunits from forest humus that cannot be accounted for by wet chemical methods. Thus, a higher resistance to biodegradation of bound, long-chainn-fatty acids and condensed lignin dimers could be shown in comparison with the wet-chemically described compounds. The mass spectra of humic substances show significant differences between fulvic acid, humic acid and humin. The computer-constructed summed spectrum of these three fractions differs significantly from the spectrum of original sample and indicates chemical alterations and selective losses during sample preparation.