Humic substances are essentially everywhere in nature. They are vital to issues in water and land conservation, such as plant nutrition, pH regulation, pollution control, water purification, and the improvement of soil conditions. As a result, this book's audience spans across many disciplines, including agriculture, biology, soil science, chemistry, biochemistry, and engineering. This is the sixth book in a series of edited volumes deriving from the Humic Substances Seminars organized by Ghabbour and Davies and held every year at Northeastern University. The book synthesizes the latest international research on humic substances and provides researchers, professionals, and graduate students with vital information emerging from the field. The International Humic Substances Society (~500 members) does not have a journal and these annual editions also serve the purpose of keeping the society members current with the research.

TABLE OF CONTENTS Preface Contributors PART 1. SOURCES AND CHARACTERIZATION 1. Structural Characterization of Humic Substances from Waste Water 2. Asymmetrical Flow Field-Flow Fractionation of Humic Substances: Comparison of Polyacrylic Acids and Polystyrene Sulfonates as Molar Mass Standards 3. Estimation of the Black Carbon Content of the IHSS Leonardite-Humin 4. Source Identification and Characterization of Humic and Fulvic Acids Isolated from Oxfordian Argillite and Opalinus Clay PART 2. SORPTION AND REACTIVITY 5. When Should Humic Substances be Treated as Dynamic Combinatorial Systems? 6. Mass Spectroscopic and Capillary Electrophoresis Studies of Humic Acids Interactions with Various Compounds and Xenobiotics 7. Photosensitized Generation of Singlet Oxygen and its Quenching by Humic Substances 8. Factors Affecting NOM Reactivity with Chlorine 9. Fluorescence and Energy Transfer Processes of Humic Substances and Related Model Compounds in Terbium Complexes PART 3. METAL BINDING AND MOBILITY: DATA AND THEORY 10. Physico-Chemical Interpretation of Complexation/Binding Capacity or Effective Humate Ligand Concentration for An(III) and An(VI) Humate Complexation 11. Physical and Chemical Kinetics in Humic Dispersions 12. Measurement of Free Metal Ion in Equilibrium with Humic-Metal Complexes using an NMR Solvent Suppression Technique 13. Quantitative Analysis of Aluminum and Soil Fulvic Acid Complexes by Solution State Aluminum-27 Nuclear Magnetic Resonance Spectroscopy 14. Affinity of Soil and Lignitic Humic Acids for Cu(II) and Cd(II) Ions 15. Trace Metal Speciation Investigation of Soil Humic Acids Isolated from New England Soils: A Capillary Electrophoresis-Inductively Coupled Plasma-Mass Spectrometry (CE-ICP-MS) Study PART 4. SOIL AGGREGATION 16. Soil Organic Matter and Aggregate Stability Affected by Tillage Index