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首页> 外文期刊>Environmental Science & Technology >Fulvic Acids as Transition State of Organic Matter: Indications from High Resolution Mass Spectrometry
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Fulvic Acids as Transition State of Organic Matter: Indications from High Resolution Mass Spectrometry

机译：黄腐酸作为有机物的过渡态：高分辨率质谱的指示

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摘要

Fulvic acids are one of the largest classes of dissolved organic matter, but they are poorly defined and of unclear origin. Three fulvic acid isolates of different origin were analyzed by size-exclusion chromatography coupled to electrospray ionization-Fourier-transform ion cyclotron resonance (FTICR)-mass spectrometry, and molecular formulas for 700-1900 species in these isolates were derived. All three isolates show the same pattern in the elemental composition of their molecules and a large congruence in the molecular sets. It is proposed that the elemental and structural regularity of fulvic acid molecules does not indicate one common precursor material and formation process, but that this regularity is due to both the strong reworking of source materials in the environment and the valency of the three elements (C, H, O) from which most fulvic acid molecules are formed. Potential molecularformulas of fulvic acids were predicted for a mass range of 60 amu based on a few presumptions. A good agreement was found between the predicted and the detected molecular formulas, and it is concluded that (poly-)carboxylic acids with very limited number of hydroxy groups are the major compound class in fulvic acid isolates. It appears that fulvic acids are metastable molecules that characterize a state of transition of diverse precursor compounds during their oxidation.
机译：黄腐酸是最大的溶解有机物类别之一，但它们定义不明确且来源不明确。通过尺寸排阻色谱联用电喷雾电离-傅立叶变换离子回旋共振（FTICR）-质谱联用分析了三种不同来源的富里酸分离物，并推导了这些分离物中700-1900种的分子式。这三个分离株在其分子的元素组成中显示出相同的模式，并且在分子组中具有较大的一致性。有人提出，富叶酸分子的元素和结构规则性并不表示一种常见的前体材料和形成过程，但是这种规则性是由于源材料在环境中的强烈返工以及这三种元素的价态（C ，H，O）形成大多数富里酸分子。根据一些假设，黄腐酸的潜在分子式的质量范围预计为60 amu。在预测的分子式和检测到的分子式之间发现了很好的一致性，并且得出结论，具有非常有限的羟基数的（聚）羧酸是黄腐酸分离物中的主要化合物类别。富叶酸似乎是亚稳态分子，其表征了各种前体化合物在氧化过程中的过渡状态。

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