Introduction
II. Origin and Sources of Arsenic Contamination
A. Geogenic
B. Anthropogenic
C. Biogenic Redistribution
III. Distribution and Speciation of Arsenic in the Environment
A. Distribution in Soil
B. Distribution in the Aquatic Environment
C. Chemical Form and Speciation
IV. Biogeochemistry of Arsenic in the Environment
A. Biogeochemistry of Arsenic in the Soil
B. Biogeochemistry of Arsenic in Aquatic Environments
V. Bioavailability and Toxicity of Arsenic to Biota
A. Toxicity to Plants and Microorganisms
B. Risk to Animals and Humans
VI. Risk Management of Arsenic in Contaminated Environments
A. Remediation of Arsenic-Contaminated Soil
B. Removal of Arsenic from Aquatic Environments
C. Multiscalar-Integrated Risk Management
VII. Summary and Future Research Needs
Acknowledgments
Reference