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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Free and esterified aliphatic carboxylic acids in humin and humic acids from a peat sample as revealed by pyrolysis with tetramethylammonium hydroxide or tetraethylammonium acetate
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Free and esterified aliphatic carboxylic acids in humin and humic acids from a peat sample as revealed by pyrolysis with tetramethylammonium hydroxide or tetraethylammonium acetate

机译：泥炭样品中的腐殖质和腐殖酸中的游离和酯化脂肪族羧酸，通过用氢氧化四甲铵或乙酸四乙铵进行热解显示

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摘要

The combination of TMAH thermochemolysis and TEAAc treatment makes it possible to discriminate between the different forms of mono- and dicarboxylic acids present in the structure of humin and humic acids, that is, "free" uncombined acids, methyl or ethyl esters present as tightly trapped molecules within the matrix, or acids chemically linked to the matrix by ester groups. The results confirm that ester groups are involved in the structure of humin and humic acids. The cross-linking of moieties originating from microbial metabolism or inherited from higher plants is partly ensured by these chemical groups. On the other hand, significant amounts of fatty monocarboxylic acids and linear dicarboxylic acids are present as free acids in the humin of the studied sample. Humin contains also fatty acid methyl esters. Free, uncombined alpha,omega-dicarboxylic acids were only found in humin. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 32]
机译：TMAH热化学分解和TEAAc处理的结合使得可以区分存在于腐殖质和腐殖酸结构中的单羧酸和二羧酸的不同形式，即“游离”未结合的酸，紧密捕获的甲基或乙基酯。基质中的分子或通过酯基化学连接至基质的酸。结果证实，酯基参与了腐殖质和腐殖酸的结构。这些化学基团部分地确保了源自微生物代谢或遗传自高等植物的部分的交联。另一方面，在研究样品的腐殖质中，大量的脂肪族一元羧酸和线性二元羧酸以游离酸的形式存在。腐殖质还包含脂肪酸甲酯。游离的，未结合的α，ω-二羧酸仅在腐殖质中发现。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：32]

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