title: Pathways of priority pesticides in sediments of coastal lagoons: The case study of Óbidos Lagoon, Portugal.
abstract: This study reports the concentrations of the priority pesticides (PPs) in 14 surface sediments and 21 layers of a sediment core from Óbidos Lagoon, a shallow Portuguese coastal lagoon. Results show that the PPs are confined to the upper part of the lagoon that receives most of the inputs from surface runoff of the surrounding agricultural fields and from small tributaries. Past and recent applied PPs were registered in sediments, aluminum normalized concentrations varying between 0.05×10(-7) and 6.85×10(-7). The PP risk assessment based on sediment quality guidelines like the "Probable Effect Level" (PEL) shows no biological effects in either sediments or aquatic organisms of Óbidos Lagoon, except for dieldrin, lindane, DDT, heptachlor epoxide and its parent compound heptachlor.
authors.affiliation: LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
authors.forename: M I
authors.initials: MI
authors.lastname: Pinto
authors.affiliation: CIIMAR, Rua dos Bragas, n° 289, 4050-123 Porto, Portugal.
authors.forename: C
authors.initials: C
authors.lastname: Vale
authors.affiliation: Institute for Analytical Chemistry, University of Vienna, Waehringerstr. 38, A-1090 Vienna, Austria.
authors.forename: G
authors.initials: G
authors.lastname: Sontag
authors.affiliation: LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal. Electronic address: jpnoronha@fct.unl.pt.
authors.forename: J P
authors.initials: JP
authors.lastname: Noronha
mesh_terms: D054750:Ecotoxicology; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis*; D011174:Portugal; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical
keywords: Coastal lagoons; Ecotoxicological risks; Pesticides; Runoff; Sediments; WFD