title: Levels and distribution patterns of polychlorinated biphenyl congeners in surface sediments from Galicia coast (Northwestern, Spain) according to granulometric characteristics.
abstract: In order to know distribution patterns of polychlorinated biphenyl congeners in the marine environment from Galida, PCBs n degrees 31, 28, 52, 101, 118, 153, 105, 138, 156 and 180 were isolated by Soxhlet extraction from three fractions of different particle size (<0.063 mm, 0.063-0.2 mm and >0.2 mm) in surface marine sediments; the quantification was performed using GC-MS and GC-ECD. Distribution of PCB congeners was shifted in favour of higher chlorinated compounds (CBs 138,153 and 180) and highly correlated to TOC content. In general, the finest fractions (<0.063 mm) of sediment presented the highest loadings of PCBs, only the sediment from As Pías zone exhibited the highest concentration of chlorinated congeners in the coarsest fraction. CB 52 concentration, slightly volatile compound, was related to water temperature. By means of multivariate techniques of data exploration as hierarchical duster analysis and principal components analysis, sediment samples from un-contaminated and slightly contaminated areas were clearly separated; groupings between samples from nearby zones appeared.
authors.affiliation: Centro de control de calidad del medio marino, Consellería de Pesca, Marisqueo y Acuicultura, Xunta de Galicia Peirao de Vilaxoán, Vilagarcía de Arousa, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Carro
authors.forename: I
authors.initials: I
authors.lastname: García
authors.forename: M
authors.initials: M
authors.lastname: Ignacio
authors.forename: A
authors.initials: A
authors.lastname: Moureira
mesh_terms: D019015:Geologic Sediments / Q000737:chemistry*; D006801:Humans; D010316:Particle Size; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D025341:Principal Component Analysis; D013030:Spain; D014874:Water Pollutants, Chemical
chemical_list: D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls