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Changes of chemical properties of humic acids from crude and fungal transformed lignite

机译：原始和真菌转化褐煤中腐殖酸化学性质的变化

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摘要

The development of biological processes for fossil energy utilization has received increasing attention in recent years. There are abundance of lignite resources in China and the lignite, a low-grade coal, can be transformed by a Penicillium sp. After fungal transformation, the contents of humic acid and water-soluble humic material increased from 38.6 percent to 55.1 percent, and from less than 4.0 percent to 28.2 percent, respectively. The differences in chemical properties of crude lignite humic acid (aHA), fungal transformed lignite humic acid (bHA) and water-soluble humic material from fungal transformed lignite (WS) were studied. Elemental analysis and size exclusion chromatography showed that the N content of bHA increased by 47.36 percent compared with aHA, and the molecular mass of bHA was smaller than aHA. And the WS with the smallest molecular mass contained most content of N. The ~(13)C NMR and FT-IR spectra of aHA and bHA showed that aHA contained more aromatic structure than bHA.
机译：近年来，用于化石能源利用的生物过程的发展受到越来越多的关注。中国有丰富的褐煤资源，青霉菌可以转化低品位褐煤。真菌转化后，腐殖酸和水溶性腐殖质的含量分别从38.6％增加到55.1％，从不到4.0％增加到28.2％。研究了粗褐煤腐殖酸（aHA），真菌转化褐煤腐殖酸（bHA）和来自真菌转化褐煤（WS）的水溶性腐殖质化学性质的差异。元素分析和尺寸排阻色谱分析表明，bHA的氮含量比aHA增加了47.36％，bHA的分子量小于aHA。分子量最小的WS含有最多的N。aHA和bHA的〜（13）C NMR和FT-IR光谱表明，aHA比bHA含有更多的芳族结构。

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