title: Butyltin levels in several Portuguese coastal areas.
abstract: This work aimed to report present levels (2007-2008 sampling) of tri- (TBT), di- (DBT), and monobutyltin (MBT) in surface sediments from 11 Portuguese coastal sites and discuss the evolution of BTs contamination in the last two decades. All the samples revealed quantifiable values of TBT, DBT, and MBT with total butyltin concentrations between 1 and 565 ng/g (of Sn in dry sediment). Maximum level of TBT, 66 ng/g, was observed in Sado estuary, at Lisnave site, in the proximity of a big shipyard. MBT decreased site by site by the same order as DBT and TBT did, but its concentrations were much higher in many cases, denoting that TBT contamination was much higher in the past. A comparison with the available previous data confirmed a marked decrease of TBT contamination all over the last years, indicating that the main sources of TBT in Portuguese coastwise stopped effectively.
authors.affiliation: CIMAR/CIIMAR-Centro Interdisciplinar de Investigação Marinha e Ambiental and Faculdade de Ciências, Universidade do Porto, R. Campo Alegre 687, 4169-007, Porto, Portugal.
authors.forename: Pedro N
authors.initials: PN
authors.lastname: Carvalho
authors.forename: Pedro Nuno R
authors.initials: PN
authors.lastname: Rodrigues
authors.forename: M Clara P
authors.initials: MC
authors.lastname: Basto
authors.forename: M Teresa S D
authors.initials: MT
authors.lastname: Vasconcelos
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis*; D009947:Organotin Compounds / Q000032:analysis*; D011174:Portugal; D012623:Seawater / Q000032:analysis*; D014220:Trialkyltin Compounds / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009947:Organotin Compounds; D014220:Trialkyltin Compounds; D014874:Water Pollutants, Chemical; C516409:mono-n-butyltin; C056189:di-n-butyltin; C011559:tributyltin