Spatial distribution and historical input of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in sediments from a subtropical estuary (Guaratuba Bay, SW Atlantic)

► Organochlorine pesticides and PCBs were analysed in a subtropical estuary. ► The concentrations detected were low and comparable to remote/pristine areas. ► The sources of organochlorine compounds (OCs) were mainly related to fluvial input. ► The OC levels detected may represent the background levels for Guaratuba Bay.