Methods to Reveal the Structure of Humic Substances

Abstract

Introduction Historical Outline Chemical Analyses Elemental Analysis Chemical Degradation Pyrolysis GC/MS Analytical and Preparative Pyrolysis Analytical and Preparative Thermochemolysis Application to Soil Organic Matter Study Spectroscopic Methods UV/Visible Spectroscopy Infrared Spectroscopy Nuclear Magnetic Resonance (NMR) Spectroscopy Other Spectroscopic Methods Molecular Weight Analysis Gel Filtration Ultrafiltration Techniques Other Methods Outlook and Perspectives Acknowledgments

Organic Geochemistry of Humic Acids From a Neogene Lignite Sample, Bulgaria

“…Their forms of linkage have been studied by several researchers in a suite of papers devoted to humic acids in soils, peat, lignite, etc. (Amblès, 2001;Grasset et al, 2002;Guignard et al, 2005;Deport et al, 2006;Válkova et al, 2009). Except "free" fatty acids extraction, authors used thermochemolysis in the presence of different alkylation reagents, i.e.…”