Gilvan Yogui is associate professor in the Department of Oceanography at Federal University of Pernambuco, Brazil. His primary areas of expertise are marine pollution, environmental chemistry and aquatic biogeochemistry. He has worked on pollution monitoring programs as well as biogeochemical studies of organic compounds (e.g., petroleum hydrocarbons, persistent organic pollutants). Dr. Yogui’s research interests include: (1) development of analytical techniques for the analysis of organic compounds; (2) participation in intercomparison programs; (3) determination, impact and fate of trace organic contaminants in the environment; and (4) investigation of the organic matter cycle in aquatic ecosystems.