chapter 1 Natural Attenuation of Trace Element Availability Assessed by Chemical Extraction -- chapter 2 Techniques for Measuring Attenuation: Isotopic Dilution Methods -- chapter 3 Biological Assessment of Natural Attenuation of Metals in Soil -- chapter 4 Long-Term Fate of Metal Contaminants in Soils and Sediments: Role of Intraparticle Diffusion in Hydrous Metal Oxides -- chapter 5 Structural Dynamics of Metal Partitioning to Mineral Surfaces -- chapter 6 Effects of Humic Substances on Attenuation of Metals: Bioavailability and Mobility in Soil -- chapter 7 Attenuation of Metal Toxicity in Soils by Biological Processes -- chapter 8 Redox Processes and Attenuation of Metal Availability in Soils -- chapter 9 Fixation of Cadmium and Zinc in Soils: Implications for Risk Assessment -- chapter 10 Natural Attenuation: Implications for Trace Metal/Metalloid Nutrition -- chapter 11 Use of Soil Amendments to Attenuate Trace Element Exposure: Sustainability, Side Effects, and Failures.