Evaluation of the contamination of platinum in estuarine and coastal sediments (Tagus Estuary and Prodelta, Portugal)
Cobelo-García, A. | Neira, P. | Mil-Homens, M. | Caetano, Miguel
Platinum contamination in estuarine and coastal sediments has been evaluated in three cores collected from the Tagus Estuary and Prodelta shelf sediments. Elevated concentrations, up to 25-fold enrichment compared to background values, were found in the upper layers of the estuarine sediments. The degree of Pt enrichment in the estuarine sediments varied depending on the proximity to vehicular traffic sources, with a maximum concentration of 9.5 ng g−1. A considerable decrease of Pt concentrations with depth indicated the absence of significant contamination before the introduction of catalytic converters in automobiles. Platinum distribution in the Tagus Prodelta shelf sediment core showed no surface enrichment; instead a sub-surface maximum at the base of the mixed layer suggested the possibility of post-depositional mobility, thereby blurring the traffic-borne contamination signature in coastal sediments.
Показать больше [+] Меньше [-]This work was partially supported by a P.I. project (ref. 200830I150) granted to A.C.G. from the Spanish Ministry of Science and Innovation. INGMAR project funded the PALEO1 cruise where Prodelta sediment core was collected and FCT project TAGUSED (POCTI/2001/CTA/41411) financed the analytical work on this core.
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