Contributors. Preface. 1. Arsenic Thermodynamic Data and Environmental Geochemistry; D.K. Nordstrom, D.G. Archer. 2. Spectroscopic Investigations of Arsenic Species in Solid Phases; A.L. Foster. 3. Geochemical Processes Controlling Transport of Arsenic in Groundwater: A Review of Adsorption; K.G. Stollenwerk. 4. Geothermal Arsenic; J.G. Webster, D.K. Nordstrom. 5. Role of Large-Scale Fluid Flow in Subsurface Arsenic Enrichment; M.B. Goldhaber, et al. 6. Arsenic in Groundwater Used for Drinking Water in the United States; S.J. Ryker. 7. Arsenic in Groundwater: South and East Asia; P.L. Smedley. 8.The Scale and Causes of the Groundwater Arsenic Problem in Bangladesh; D.G. Kinniburgh, et al. 9. Mechanisms of Arsenic Release to Water from Naturally Occurring Sources, Eastern Wisconsin; 10. Arsenic in Southeastern Michigan; A. Kolker, et al. 11. Occurrence of Arsenic in Ground Water of the Middle Rio Grande Basin, Central New Mexico; L.M. Bexfield, I.N. Plummer. 12. Arsenic Contamination in the Water Supply of Milltown, Montana; J.N. Moore, W.W. Woessner. 13. Natural Remediation Potential of Arsenic-Contaminated Ground Water; K.G. Stollenwerk, J.A. Coleman. 14. Modeling In Situ Iron Removal from Groundwater with Trace Elements Such as As; C.A.J. Appelo, W.W.J.M. de Vet. 15. In Situ Arsenic Remediation in a Fractured Alkaline Aquifer; A.H. Welch, et al. References Cited. Index.