Chemicals in the Aquatic Environment

I Background.- 1. Introduction.- 2. Ecosystem Variability and Gradients. Examples from the Baltic Sea as a Background for Hazard Assessment.- 3 The ESTHER Approach to Environmental Hazard Assessment of Chemicals.- II Special Topics.- 4 Factors Determining the Fate of Organic Chemicals in the Environment: the Role of Bacterial Transformations and Binding to Sediments.- 5 Bioavailability and Uptake of Xenobiotics in Fish.- 6 Bioaccumulation and Biomagnification of Hydrophobic Persistent Compounds as Exemplified by Hexachlorobenzene.- 7. Fish Bile Analysis for Monitoring of Low Concentrations of Polar Xenobiotics in Water.- 8 Ecological Concepts Important for the Interpretation of Effects of Chemicals on Aquatic Systems.- 9 Selected Assays for Health Status in Natural Fish Populations.- 10 Community Testing, Microcosm and Mesocosm Experiments: Ecotoxicological Tools with High Ecological Realism.- III Case Studies.- 11 Advanced Hazard Assessment of Arsenic in the Swedish Environment.- 12 Advanced Hazard Assessment of 4,5,6-Trichloroguaiacol in the Swedish Environment.- 13 A Tentative Hazard Assessment of Hexachlorobenzene in the Aquatic Environment.- IV Conclusions.- 14 Concluding Remarks.- Appendix I.- Species and Genera Index.