Transport of Metals Across Membranes (K. Simkiss & M. Taylor). Interactions between Trace Metals and Aquatic Organisms: A Critique of the Free-Ion Activity Model (P. Campbell). Environmental Organometallic Chemistry of Mercury, Tin and Lead: Present Status and Perspectives (E. Pelletier). Problems in Trace Metal Speciation Modeling (D. Turner). Trace Metal Speciation of Labile Chemical Species in Natural Water: Electrochemical Methods (A. Mota & M. Correia dos Santos). Trace Metal Speciation of Labile Chemical Species in Natural Waters and Sediments: Non-Electrochemical Approaches (S. Apter & G. Batley). Chromatographic Approaches to Trace Element Speciation of Non-Labile Chemical Species (W. Marshall & G.-M. Momplaisir). The Trophic Transfer of Metals in Marine Systems (N. Fisher & J. Reinfelder). Biological Factors Involved in Metal Concentrations Observed in Aquatic Organisms (W. Langston & S. Spence). Metal Detoxification in Aquatic Organisms (A. Mason & K. Jenkins). Prediction of Metal Toxicity in Nature from Bioassays: Limitations and Research Needs (S. Luoma). Index.