part Section A: Fundamental Principles -- chapter 1 Risk Assessment in Environmental Contamination and Environmental Health -- chapter 2 Bioavailability of Metals in the Soil Plant Environment and its Potential Role in Risk Assessment -- chapter 3 The Role of Chemical Speciation in Bioavailability -- part Section B: Indicators of Bioavailability -- chapter 4 Microbial Parameters as Indicators of Toxic Effects of Heavy Metals on the Soil Ecosystem -- chapter 5 Metal-Algae Interactions: Implications of Bioavailability -- chapter 6 Absorption and Translocation ofChromium by Plants: Plant Physiological and Soil Factors -- chapter 7 Plant Soil Metal Relationships from Micro to Macro Scale -- part Section C: Case Studies -- chapter 8 Effects of Mine Wastewaters on Freshwater Biota in Tropical Northern Australia -- chapter 9 Inplace Inactivation and NaturalEcological Restoration Technologies (IINERT) -- chapter 10 An Assessment of the Revegetation Potential of Acidic Basemetal Tailings using Metal-Tolerant Grass Species and Lime -- chapter 11 Groundwater Arsenic Contamination in West Bengal-lndia and Bangladesh: Case Study on Bioavailability of Geogenic Arsenic -- chapter 12 Bioavailability, Toxicity and Risk Relationships in Ecosystems: The Path Ahead.