IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Assessment of trace metals and butyltin species in uperficial estuarine water (dissolved and SPM) and zooplankton from Bahía Blanca Estuary, Argentina
Autor/es:
FERNÁNDEZ SEVERINI MELISA DAIANA; BOTTÉ SANDRA; DELUCCHI FEDERICO; HOFFMEYER MÓNICA SUSANA; MARCOVECCHIO JORGE EDUARDO
Lugar:
Bahía Blanca
Reunión:
Simposio; ECSA 44 Symposium; 2008
Institución organizadora:
ECSA (Estuarine and Coastal Science Association)-IADO(Instituto Argentino de Oceanografía)
Resumen:
The distribution and concentration of trace metals (Cd and Cu) and organotin compounds (DBT and TBT) within Bahía Blanca estuary were investigated. The matrixes analyzed were dissolved phase, suspended particulate matter (SPM) and zooplankton. Cd and Cu values in SPM and zooplankton showed similar patterns with pronounced seasonal variations (highest concentrations in autumn and spring). Both Cd and Cu have ranged from below the detection limit to 22.26 µg g-1 and 25.54 µg g-1, respectively in SPM. Meanwhile the concentration in the zooplankton varied between below the detection limit to 37.42 µg g-1 for Cd and 48.13 µg g-1 for Cu. Almost all dissolved Cd values were below detection limit, while dissolved Cu ranged from 0.54 µg L-1 to 2.40 µg L-1.  A very high correlation for Cd between zooplankton and SPM (p<<0.001) was found, indicating similar origins or affected by similar regulator processes. Both DBT and TBT were found adsorbed to SPM in all the studied sites from non detected in non impacted areas to higher values (395.2 ng Sn.g-1 for TBT and 63.6 ng Sn.g-1 for DBT) next to harbor areas. Both parameters of bioaccumulation, BCF and BMF, were calculated. Mean values of the Log(BCF) of marine zooplankton for Cd and Cu fell in the range 0.5-2.3, being higher for Cd. Meanwhile the results show the organisms are poorly enriched in these metals with respect to its surrounding environment. Besides, the negative Log (BMF) values reveal that Cu concentration is higher in the SPM, and the positive one for Cd indicate a small biomagnifications of this metal in the zooplankton. Zooplankton Cd values registered in autumn and spring are higher compared to those reported for impacted marine environments around the world but Cu values are within the reported range. Besides the results suggested anthropogenic input of butyltin species and Cd which is particularly incorporated in the zooplankton mainly from the particulate phase.