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Characterization of Fulvic Acid by Laser-Desorption Mass Spectrometry

机译：激光解吸质谱法测定富勒酸的含量

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Fulvic acid is a complex, heterogeneous mixture of organic substances formed by the profound alteration of organic materials in natural environments. The ubiquity of fulvic acid and its role in many geochemical processes has made it the subject of a substantial amount of fundamental and applied research. Despite this interest, fulvic acid's molecular weight (or more appropriately because it is a mixture, its molecular weight distribution) has never been unambiguously determined. Yet, it is often this fundamental, enigmatic characteristic that is specifically correlated to many of the environmental interactions of fulvic acid. Its molecular weight has been related to the ability of fulvic acid to complex trace metals and radionuclides and aid in their transport through or removal from an aquatic system, the extent to which it will bind to organic contaminants, its ability to interact with inorganic colloids and mineral surfaces, its tendency to form trihalomethanes during drinking water treatment, and its tendency to aggregate with other organic molecules. In fact, the one characteristic of fulvic acid that seems to be identified as an important variable in many aspects of its chemistry in natural systems is molecular weight. The purpose of this paper is to report the molecular weight distributions of a suite of well-characterized fulvic acids as determined by laser-desorption (LD) Fourier transform mass spectrometry (FTMS) and compare them to the molecular weight distributions obtained by gel filtration chromatography and vapor pressure osmometry. These results provide definitive proof that low molecular weight substances dominate the components of the mixture which comprise fulvic acid.
机译：黄腐酸是有机物质的复杂，异质混合物，是通过自然环境中有机材料的深刻变化而形成的。黄腐酸的普遍存在及其在许多地球化学过程中的作用使其成为大量基础研究和应用研究的主题。尽管有这种兴趣，但从未明确确定富里酸的分子量（或更合适地，因为它是混合物，其分子量分布）。然而，通常这种基本的，神秘的特征与黄腐酸的许多环境相互作用特别相关。它的分子量与富里酸对复杂的痕量金属和放射性核素的能力有关，并有助于它们通过水生系统运输或从水生系统中去除，与有机污染物结合的程度，与无机胶体相互作用的能力以及矿物表面，在饮用水处理过程中形成三卤甲烷的趋势以及与其他有机分子聚集的趋势。实际上，富里酸的一个特征似乎是分子量，它在自然系统中化学的许多方面都被认为是重要的变量。本文的目的是报告通过激光解吸（LD）傅里叶变换质谱（FTMS）测定的一整套表征良好的黄腐酸的分子量分布，并将其与通过凝胶过滤色谱法获得的分子量分布进行比较和蒸汽压渗透压法。这些结果提供了确定的证据，表明低分子量物质在包含黄腐酸的混合物组分中占主导地位。

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