The realization during the last decade that many water supplies worldwide are affected by arsenic at concentrations above acceptable health levels has motivated research directed at understanding the occurrence, distribution, and mobilization of arsenic in the environment, and stimulated the development of new, cost-effective treatment technologies. Arsenic accumulation and migration is closely tied to its chemical speciation, which is often controlled by a complex combination of abiotic and biotic processes coupled with physical transport. This symposium volume focuses on bridging the gap between different approaches and scales of investigation and on fostering a more unified understanding of arsenic occurrence and behavior, including geological, geochemical, hydrological, microbiological, ecological, and engineering aspects of arsenic-related research. Papers in this volume highlight a variety of new research directed at understanding the sources, distribution, and mobilization of arsenic in the environment. It includes recent efforts in the development of cost-effective treatment technologies and in approaches to natural attenuation and accelerated remediation methods. These topics are thematically organized into three sections in the volume, the first focusing on laboratory studies and theoretical modeling, the second on arsenic behavior and cycling in a range of field settings, and the third on studies associated with treatment and remediation technologies and methods. This book is targeted at scientists and engineers (chemists, geochemists, geologists, hydrogeologists, microbiologists, molecular biologists, chemical engineers, environmental engineers) as well as graduate students who are engaged in research on arsenic in both natural and engineered aqueous systems, and on the development of methods for arsenic treatment and removal.

Table of Contents:
1.: Peggy A. O'Day, Dimitrios Vlassopoulos, Xiaoguang Meng, and Liane Benning: Advances in Aresnic Research: Introductory Remarks 2.: Janet G. Hering and Suvasis Dixit: Contrasting Sorption Behavior of Aresnic(III) and Aresnic(V) in Suspensions of Iron and Aluminum Oxyhydroxides 3.: Chunming Su and Richard T. Wilkin: Arsenate and Aresenite Sorption on and Arsenite Oxidation by Iron(II,III) Hydroxycarbonate Green Rust 4.: L. Charlet, S. Chakraborty, S. Varma, C. Tournassat, M. Wolthers, D. Chatterjee, and G. Roman Ross: Adsorption and Heterogeneous Reduction of Arsenic and the Phyllosilicate-Water Interface 5.: M. Wolthers, I.B. Butler, D,. Rickard, and P.R.D. Mason: Arsenic Uptake by Pyrite at Ambient Environmental Conditions: A Continuous-Flow Experiment 6.: Mitchell Herbel and Scott Fendorf: Transformation and Transport of Arsenic within Ferric Hydroxide Coated Sands upon Dissimilatory Reducing Bacterial Activity 7.: Tanja Radu, Jeremiah C. Hilliard, Jae K. Yang, and Mark O. Barnett: Transport of As(III) and As(V) in Experimental Subsurface Systems 8.: James D. Kubicki: Comparison of As(III) and As(V) Complexation onto Al- and Fe-Hydroxides 9.: J.A. Tossell: Calculation of the Interaction of Bicarbonate Ion with Arsenites in Aqueous Solution and with the Surfaces of Al Hydroxide Minerals 10.: Joyanto Routh, Ambujom Sarawathy, Sisir Kanti Nag, S.P. Sinha Ray, and Gunnar Jacks: Arsenic Reduction by Indigenous Bacteria in Shallow Aquifers from Ambikanagar, West Bengal, India 11.: Thomas R. Holm, Walton R. Kelly, Steven D. Wilson, George S. Roadcap, Jonathan L. Talbott, and John S. Scott: Arsenic Distribution and Speciation in the Mahomet and Glasford Aquifers, Illinois 12.: T.L. Root, J.M. Bahr, and M.B. Gotkowitz: Controls on Arsenic Concentrations in Groundwater near Lake Geneva, Wisconsin 13.: M.E. Serfes, S.E. Spayd, G.C. Herman: Arsenic Occurence, Sources, Mobilization, and Transport in Groundwater in the Newark Basin of New Jersey 14.: J.A. Sauders, S. Mohammad, N.E. Korte, M.-K. Lee, M. Fayek, D. Castle, and M.O. Barnett: Groudwater Geochemistry, Microbiology, and Mineralogy in Two Arsenic-Bearing Holocene Alluvial Aquifers from the United States 15.: A.R. Keimowitz, H.J. Simpson, S.N. Chillrud, M. Stute, M. Tsang, S. Datta, and J. Ross: Oxidation of Groudwater Arsenic and Iron 16.: Stephanie S. Chow and Martial Taillefert: Arsenic Diagenesis at the Sediment-Water Interface of a Recently Flooded Freshwater Sediment 17.: Margarita Guitierrez-Ruiz, Mario Villalobos, Francisco Romero, and Pilar Fernandez-Lomelin: Natural Attenuation of Aresenic in Semiarid Soils Contaminated by Oxidized Arsenic Wastes 18.: Jenny G. Webster-Brown and Vincent Lane: Modeling Seasonal Arsenic Behavior in the Waikato River, New Zealand 19.: Mohammed Badruzzaman and Paul Westerhoff: The Applicaion of Rapid Small Scale Column Tests in Iron-Based Packed Bed Arsenic Treatment Systems 20.: Baolin Deng, Mendy Caviness, and Zhimang Gu: Arsenic Removal by Activated Carbon-Based Materials 21.: Jun Fang, Baolin Deng, and T.M. Whitworth: Arsenic Removal from Drinking Water Using Clay Membranes 22.: Siddesh Shevade and Robert G. Ford: Zeolite Performance as an Anion Exchanger for Arsenic Sequestrian in Water 23.: Hun-Young Wee and Timothy A. Kramer: Characterization of Arsenic-Containing Water Treatment Residuals 24.: Tielian Xu, Yong Cai, Stephen P. Mezyk, and Kevin E. O'Shea: The Roles of Hydroxyl Radical, Superoxide Anion Radical, and Hydrogen Peroxide in the Oxidization of Arsenite by Ultrasonic Irradation 25.: Dimitrios Vlassopoulos, Nelson Rivera, Peggy A. O'Day, Michael T. Rafferty, and Charles B. Andrews: Arsenic Removal by Zero-Valent Iron: A Field Study of Rates, Mechanisms, and Long-Term Performance 26.: Nikolaos P. Nikolaidis, Zhongqi Cheng, and Alexander van Geen: Removal of Arsenic from Bangladesh Groundwater with Zero-Valent Iron 27.: Phillip T. Crisp, Ahmedul Hye Chowdhury, Andrew Lau, Quazi Quamruzzaman, and Mahmuder Rahman: Assessment of Safe Water Options for Villages in Bangladesh 28.: Ahmedul Hye Chowdhury and Phillip T. Crisp: Two-Year Operation of an Air-Iron Treatment System for the Removal of Arsenic from Simulated Bangladeshi Tubewell Water 29.: Ming-Kuo Lee, James A. Saunders, Richard T. Wilkin, and Shahnewaz Mohammad: Geochemical Modeling of Arsenic Speciation and Mobilization: Implications for Bioremediation