This book comprises 10 authored chapters on heavy metal dynamics in the plant root zone. The chapters are authoritatively written and include ample diagrams, images and equations. Many physico-chemical and biological factors affect the chemical speciation of heavy metals. As such, the topic is interdisciplinary and this book aims to provide a synthesis of key areas, with particular emphasis on metal reactivity, bioavailability, transport and chemistry. The initial two chapters discuss metal interactions based on equilibrium, kinetic and multi-reaction models, as well as non-equilibrium transport models combining hydrological, chemical and biological processes. The third chapter focusses on bioavailability of As and Se, detailing adsorption, precipitation, dissolution and redox reactions. Selenium bioavailability and phytoremediation, colloid-associated transport at mining sites and trace element biogeochemistry in plant rhizospheres are discussed in the next three chapters. Following chapters provide accounts of heavy metals in runoff waters, and the significance of wetland plants in influencing metal mobility. The book concludes with potential effects of metals in biosolid-amended soils towards crops, important because of potential transfer to groundwater. Microbes have a profound influence on soil biogeochemistry, but I found that the significance of bacterial and fungal populations (including symbiotic mycorrhizal fungi) is rather brief or lacking in this book, except where As and Se are discussed. Referral to other works may be necessary for a fuller picture. Nevertheless, the book will be of interest to scientists working in a broad range of disciplines as well as newcomers to the field.