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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Structural differences of Chernozem soil humic acids SEC-PAGE fractions revealed by thermal (TG-DTA) and spectroscopic (DRIFT) analyses.
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Structural differences of Chernozem soil humic acids SEC-PAGE fractions revealed by thermal (TG-DTA) and spectroscopic (DRIFT) analyses.

机译：通过热（TG-DTA）和光谱（DRIFT）分析揭示了黑钙土土壤腐殖酸SEC-PAGE组分的结构差异。

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摘要

Humic acid extracted from the A horizon of a Chernozem soil and their different molecular size (MS) fractions obtained by SEC-PAGE were investigated using thermal (TG-DTA), spectroscopic (DRIFT) and isotopic ( delta 13C) analyses. Moreover, the molecular structure of the high temperature stable fraction (residues above 400 degrees C) was studied by DRIFT spectroscopy. The lowest MS fraction (C+D) was characterized by the highest content of aromatic compounds and by the lowest content of aliphatic and carboxyl groups, carbohydrates and amino acids with respect to the other fractions. Nevertheless, the aromatic structure of A and B fractions seems to be more complex. The delta 13C values which indicated the presence of urea traces in the lowest MS fractions (B and C+D) may be due to the purification process.
机译：利用热（TG-DTA），光谱（DRIFT）和同位素（δ 13 C）分析。此外，通过DRIFT光谱法研究了高温稳定级分（高于400℃的残基）的分子结构。最低的MS馏分（C + D）的特征在于，相对于其他馏分，芳族化合物的含量最高，而脂肪族和羧基，碳水化合物和氨基酸的含量最低。然而，A和B级分的芳族结构似乎更复杂。表示最低MS馏分（B和C + D）中存在尿素痕量的δ 13 C值可能是由于纯化过程所致。

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