I. Usage Patterns and Environmental Fate of Pentachlorophenol.- Patterns of Pentachlorophenol Usage in Canada - An Overview.- Patterns of Pentachlorophenol Usage in the United States of America - An Overview.- Photolysis of Pentachlorophenol in Water.- Degradation of Pentachlorophenol in Soil, and by Soil Microorganisms.- The Fate of Pentachlorophenol in an Aquatic Ecosystem.- The Environmental Fate of 14C-Pentachlorophenol in Laboratory Model Ecosystems.- II. Pharmacology and Toxicology of Pentachlorophenol.- A. Metabolism.- Microbial Metabolism of Pentachlorophenol.- Fate of Pentachlorophenol in the Blue Crab, Callinectes sapidus.- Metabolism of Pentachlorophenol in Fishes.- Studies on the Uptake, Disposition and Metabolism of Pentachlorophenol and Pentachloroanisole in Rainbow Trout (Salmo gairdneri).- Dechlorination of Pentachlorophenol in vivoandin vitro.- Pentachlorophenol in Different Species of Vertebrates after Administration of Hexachlorobenzene and Pentachlorobenzene.- B. Comparative Toxicology and Pharmacology.- Toxicity of Pentachlorophenol and Related Compounds to Early Life Stages of Selected Estuarine Animals.- Effects of Sodium Pentachlorophenate on Several Estuarine Animals: Toxicity, Uptake and Depuration.- Effects of Dowicide® G-ST on Development of Experimental Estuarine Macrobenthic Communities.- Effects of Pentachlorophenol on the Meiobenthic Nematodes in an Experimental System.- Effect of Sodium Pentachlorophenate on the Feeding Activity of the Lugworm, Arenicola cristata Stimpson.- Toxicity of Sodium Pentachlorophenate to the Grass Shrimp, Palaemonetes pugio, in Relation to the Molt Cycle.- Inhibition of Limb Regeneration in the Grass Shrimp, Palaemonetes pugio, by Sodium Pentachlorophenate.- Effect of Sodium Pentachlorophenate onExoskeletal Calcium in the Grass Shrimp, Palaemonetes pugio.- Ultrastructural Changes Induced by Sodium Pentachlorophenate in the Grass Shrimp, Palaemonetes pugio, in Relation to the Molt Cycle.- Effects of Sodium Pentachlorophenate and 2,4-Dinitrophenol on Respiration in Crustaceans.- Effects of Sodium Pentachlorophenate and 2,4-Dinitrophenol on Hepatopancreatic Enzymes in the Blue Crab, Callinectes sapidus.- Effect of Pentachlorophenol on the ATPases in Rat Tissues.- Effects of Sodium Pentachlorophenate on Survival and Energy Metabolism of Embryonic and Larval Steelhead Trout.- Results of Two-Year Toxicity and Reproduction Studies on Pentachlorophenol in Rats.- III. Chlorophenols and Their Contaminants: Chemistry, Toxicology, Environmental Residues and Environmental Impact.- Impurities in Commercial Products Related to Pentachlorophenol.- Genetic Activity of Chlorophenols and Chlorophenol Impurities.- Negative Chemical Ionization Mass Spectrometry: Applications in Environmental Analytical Chemistry.- Human Exposure to Pentachlorophenol.- Survey of Pesticide Residues and Their Metabolites in Urine from the General Population.- Health Implications of 2,3,7,8-Tetrachlorodibenzo-p-dioxin Exposure in Primates.- Renal Effects of 2,3,7,8-Tetrachlorodibenzo-p-dioxin.- Environmental Impact of Pentachlorophenol and Its Products-A Round Table Discussion.