期刊
BIOLOGY AND FERTILITY OF SOILS
卷 37, 期 4, 页码 255-259出版社
SPRINGER
DOI: 10.1007/s00374-003-0583-8
关键词
humic substances; supramolecular associations; dicarboxylic acids; self-assembling conformations; molecular sizes
类别
Changes in molecular size distributions of four different humic materials were evaluated through high performance size-exclusion chromatography (HPSEC), before and after treating humic solutions with naturally occurring dicarboxylic (oxalic, malonic, succinic and glutaric) acids. Chromatograms of dissolved humic substances showed a decrease in peak absorbance as well as an increase in peak elution volume when the solution pH was lowered from 7 to 3.5 by addition of dicarboxylic acids before HPSEC analysis. The resulting reduction in molecular size is explained by the disruption of unstable humic superstructures into smaller-sized associations stabilized by the formation of strong intra- and intermolecular hydrogen bonds among humic molecules. The extent of humic size variation was in the order: oxalic
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