Polycyclic Aromatic Hydrocarbons in the South American Environment.- Silver as a Disinfectant.- Impact of Soil Properties on Critical Concentrations of Cadmium, Lead, Copper, Zinc, and Mercury in Soil and Soil Solution in View of Ecotoxicological Effects.- Critical Soil Concentrations of Cadmium, Lead, and Mercury in View of Health Effects on Humans and Animals.- Fluoroquinolone Antibiotics in the Environment.- Explosives: Fate, Dynamics, and Ecological Impact in Terrestrial and Marine Environments.