2nd Edition

Humic Matter in Soil and the Environment Principles and Controversies, Second Edition

By Kim H. Tan Copyright 2014
    496 Pages 69 B/W Illustrations
    by CRC Press

    The field of humic matter research has undergone drastic changes in concepts and principles since the first edition of Humic Matter in Soil and the Environment: Principles and Controversies was published more than a decade ago. Still the only book of its kind specifically addressing humic acid principles and controversies, the Second Edition presents the newest advances in humic acid science. Eleven new and rewritten chapters replace the original nine, with updated material representing modern humic acid chemistry. This includes the delineation of organic matter, humus, and humic matter.

    The book begins by considering organic matter as a whole, describing terrestrial and aquatic organic matter. It examines humus as a mixture of humified and nonhumified organic matter, focusing also on the importance of the nonhumified fraction—plant biopolymers in their original or slightly decomposed forms—as raw materials for formation of the humic fraction. The book then presents concepts of humic matter, referred to as humic acid, covering a range of ideas from traditional views of biopolymers to the latest concepts based on micellar, supramolecular, and nanotube chemistry. The author presents the major pathways of humification and discusses humification theories. He also examines the extraction, isolation, and fractionation of humic matter.

    The book reviews the chemical composition and model structures of humic acids, the chemical and spectroscopic characterization of humic substances, and the electrochemical properties of humic matter. It also addresses the agronomic, environmental, and industrial (including pharmaceutical) importance of humic matter. This revised and updated edition continues the tradition of providing comprehensive coverage of the genesis, extraction, properties, and impacts of humic matter.

    Issue of Organic Matter
    Concept of Organic Matter
    Issue of Biomass
    Terrestrial and Aquatic Organic Matter
    Issue of Dissolved Organic Matter or DOM
    Effect of Organic Matter on Ecology and Water Chemistry
    Issue of Acronyms

    Concept of Humus
    Issue of Humus
    Nonhumic Fraction of Humus
    Humic Fraction of Humus
    Issue of Glomalin

    Concepts of Humic Matter
    Overview: From Biopolymers to Nanotube Supramolecular Assemblages
    Biopolymer Concept
    Operational Concept
    Issue of Real Compounds
    Micellar Concept
    Supramolecular Concept
    Nanotube Membrane Concept

    Nature and Distribution of Humic Matter
    Historical Background: Era of Ulmic, Crenic, and Geic Acids
    Distribution of Humic Matter
    Classification of Humic Matter

    Genesis of Humic Matter
    Major Pathways of Humification
    Precursors of Humic Matter
    Theories of Humification
    Statistical Modeling of Humification

    Extraction and Fractionation of Humic Substances
    Search for Extractants
    Terrestrial Humic Matter
    Fractionation of Humic Substances
    Aquatic Humic Matter
    Determination of DOC and DOM
    Types of Humic Substances

    Chemical Composition of Humic Matter
    Elemental Composition
    Group Composition
    Theory of Minimum Formula Weights
    Molecular Structures
    Computer Modeling of Humic Acid Structures

    Characterization of Humic Substances
    Chemical Characterization
    Molecular Weights
    Ultraviolet and Visible Light Spectrophotometry
    Infrared Spectroscopy
    Nuclear Magnetic Resonance Spectroscopy
    Electron Microscopy of Humic Matter

    Electrochemical Properties of Humic Matter
    Origin and Types of Electric Charges
    Surface Charge Density
    Electric Double Layer
    Chemical Reactions and Interactions
    Complex Reaction and Chelation
    Bridging Mechanism

    Agronomic Importance of Humic Matter
    Importance in Soils
    Effect on Soil Physical Properties
    Effect on Soil Chemical Properties
    Effect on the Soil Redox System
    Effect on Soil Biological Properties
    Importance in Plant Growth

    Environmental and Industrial Importance of Humic Matter
    Importance in the Environment
    Importance in Industry
    Importance as Pharmaceuticals
    References and Additional Readings
    Appendix A: Greek Alphabet
    Appendix B: Atomic Weights of Major Elements in Soils


    Kim Howard Tan, Ph.D., is professor emeritus at the Department of Crops and Soil Science, University of Georgia, Athens, USA, where he has taught basic soils, soil chemistry, advanced soil chemistry, and methodology of soil and plant analysis for more than 25 years. His humic acid research has made him one of the authorities on humic acid chemistry and organic–inorganic interaction reactions. He was named Fellow of the American Society of Agronomy and the Soil Science Society of America and is a member of the International Union of Soil Science. Dr. Tan is an author or coauthor of more than 200 articles, abstracts, proceedings, and book chapters, as well as the author, coauthor, or editor of 13 books.