Persistent Organic Pollutants (POPs) in Eastern and Western South American Countries -- Ecotoxicological Assessment of the Highly Polluted Reconquista River of Argentina -- Paper Manufacture and Its Impact on the Aquatic Environment -- Human Exposure to Lead in Chile -- Human Nails as a Biomarker of Element Exposure. Reviews of Environmental Contamination and Toxicology attempts to provide concise, critical reviews of timely advances, philosophy, and significant areas of accomplished or needed endeavor in the total field of xenobiotics, in any segment of the environment, as well as toxicological implications.