This volume contains papers selected from those presented at the International Symposium on the Analysis of Hydrocarbons and Halogenated Hydrocarbons in the Aquatic Environment, May 23-25, 1978. The Symposium was organized by the National Water Research Institute of Environment Canada and the Institute for Environmental Studies of the University of Toronto. The purpose of the Symposium and of this volume was to bring together information on the analyses, behaviour and effects of hydro carbons and halogenated hydrocarbons on the aquatic environment. This class of contaminants presents many difficult analytical pro blems, and to a large extent our ability to identify environmental problems and assess their severity, depends on the availability of proved analytical techniques. By exposing workers in this field to the techniques and results of others we hope that progress can be made towards solving the many problems caused by these substances. The papers in this volume are divided into five categories: two plenary session addresses given by J.P. Bruce and O. Hutzinger, 11 papers describing quantitative analytical results, 12 papers on analytical methods, 9 papers on incidence, monitoring and pathways; and finally, 13 papers on drinking water, health and biological effects. We were fortunate in having the support of the many organizations and individuals listed after this preface. In particular we thank B.F. Scott and R. Knechtel for their help in organizing the Symposium, S. Paterson, C. Straka, B. Reuber, A. Bobra, R. Wan, S. Austin, G.E.

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Keynote Address.- Hydrocarbons and Halogenated Hydrocarbons in the Aquatic Environment: Some Thoughts on the Philosophy and Practice of Environmental Analytical Chemistry.- The Sampling and Measurement of Hydrocarbons in Natural Waters.- A Fast Quantitative Analysis of a Wide Variety of Halogenated Compounds in Surface-, Drinking-, and Groud-Water.- Adsorption of Insecticide Residues Importance in Environmental Sampling and Analysis.- Methodology for the Isolation of Polynuclear Aromatic Hydrocarbons for Qualitative, Quantitative, and Bioassay Studies.- Benzo(a)pyrene in the Marine Environment: Analytical Techniques and Results.- Chromatographic and Spectral Analysis of Polycyclic Aromatic Hydrocarbons in the Air and Water Environments.- Presence and Potential Significance of o-o'-Unsubstituted PCB Isomers and Trace Aroclor® 1248 and 1254 Impurities.- Analysis of Mirex in Lake Sediments: Problems and Solutions.- Chloro-Organic Compounds in the Lower Fox River, Wisconsin.- The Determination and Levels of Polycyclic Aromatic Hydrocarbons in Source and Treated Waters.- Multicomponent Polycyclic Aromatic Hydrocarbon Analysis of Inland Water and Sediment.- An Evaluation of Purging Methods for Organics in Water.- Determination of Purgeable Organics in Sediment.- Analysis of Headspace Gases for Parts Per Billion Concentrations of Volatile Organic Contaminants in Water Samples by Gas Chromatography.- Evaluation of Analytical Techniques for Assessment of Treatment Processes for Trace Halogenated Hydrocarbons.- The Examination and Estimation of the Performance Characteristics of a Standard Method for Organochlorine Insecticides and PCB.- A System for the Preparation of Organohalogen Reference Materials with Marine Lipid Matrices.- Chemical Ionization Mass Spectrometry ofHydrocarbons and Halohydrocarbons.- Identification and Quantitative Analysis of Polychlorinated Biphenyls on WCOT Glass Capillary Columns.- Automatic Analysis of Organic Pollutants in Water Via GC/MS.- Quantification of Polycyclic Aromatic Hydrocarbons in Marine Environmental Samples.- Reproductive Success of Herring Gulls as an Indicator of Great Lakes Water Quality.- Pesticide Monitoring in the Prairies of Western Canada.- Importance of Particulate Matter on the Load of Hydrocarbons of Motorway Runoff and Secondary Effluents.- Organochlorines in Precipitation in the Great Lakes Region.- Polycyclic Aromatic Hydrocarbons in the Marine Environment: Gulf of Maine Sediments and Nova Scotia Soils.- Halogenated Hydrocarbons in Dutch Water Samples Over the Years 1969 1977.- A Model System for the Investigation of Methods of Herbicide Speciation.- Anthropogenic C1 and C2 Halocarbons: Potential Application as Coastal Water-Mass Tracers.- Prediction of Volatilization Rates of Chemicals in Water.- Chlorinated Phenolic Compounds: Formation, Detection, and Toxicity in Drinking Water.- Screening South African Drinking-Waters for Organic Substances Hazardous to Health.- Trihalomethane Levels at Selected Water Utilities in Kentucky, U.S.A..- Formation of Trihalomethanes During Chlorination and Determination of Halogenated Hydrocarbons in Drinking Water.- Trihalomethane Levels in Canadian Drinking Water.- Aquatic Organism Pathobiology as a Sentinel System to Monitor Environmental Carcinogens.- Bacterial Degradation of Crude Oil and Oil Components in Pure and Mixed Culture Systems.- Induction of Mixed Function Oxidase Enzymes in Fish by Halogenated and Aromatic Hydrocarbons.- Halogenated Biphenyl Metabolism.- Toxicity of Hydrocarbons and Their Halogenated Derivatives in an AqueousEnvironment.- Fish Tumor Pathology and Aromatic Hydrocarbon Pollution in a Great Lakes Estuary.- Bioaccumulation of Arene and Organochlorine Pollutants by Cipangopaludina Chinensis (Gray, 1834) (Mollusca: Gastropoda) from Ponds in the Royal Botanical Gardens, Hamilton, Ontario.- The Correlation of the Toxicity to Algae of Hydrocarbons and Halogenated Hydrocarbons with their Physical-Chemical Properties.- Erratum.