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Distribution of rare earth elements in estuarine sediments from the Tagus Estuary (Portugal): Evidence of anthropogenic contamination Pedro Brito1.2.3. Isabel Caçador2. Ricardo Prego4. Mário Mil-Homens1.3. Miguel Caetano1 1IPMA - Portuguese Institute of Sea and Atmosphere. Rua Alfredo Magalhães Ramalho. 6. 1495-006 Lisbon. Portugal; 2FCUL - Faculdade de Ciências. Universidade de Lisboa. Campo Grande. 1749-016 Lisbon. Portugal; 3CIIMAR - CIIMAR. Interdisciplinary Centre of Marine and Environmental Research. University of Porto. Portugal; 4CSIC-IIM - Marine Research Institute (CSIC). Av. Eduardo Cabello. 6. E-36208 Vigo. Spain
INTRODUCTION The rare earth elements (REE) have been intensively studied as natural tracers of biogeochemical processes [1]. Due to their consistent behaviour the REE are widely used as tracers of sources and processes controlling trace element distribution in marine sediments [2. 3. 4]. The Tagus estuary. one of the largest in Europe (320 km2 total area). has been contaminated mainly by two industrial areas located in the north and south margins [5. 6]. and domestic effluents from the metropolitan area of Lisbon [7]. The aim of this work was to study the REE distribution and fractionation patterns in surface sediments from the Tagus estuary and to assess rule of urban and industrial activities as sources of anomalous REE concentrations.
MATERIAL AND METHODS Sampling Tagus estuary surface sediments (0-5 cm layer) were collected with a Van Veen grab sampler in 10 sampling stations (Fig.1).
Sediment Preparation Sediments were dried at 40° C. sieved through a 2-mm mesh and grounded with an agate mortar.
Grain size analysis Sediment fractions separated by wet sieving.
• silt and clay sediment (< 63 µm) higher SREE concentrations • Middle-REE (MREE) enrichment relative to LREE and Heavy-REE (HREE)
T2 T4 T5
0,60
T6 T7
0,40
T8 T9
0,20
T10
0,00 La
Ce
Pr
Nd
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
FINAL CONSIDERATIONS •Higher SREE concentrations evidence possible anthropogenic contamination; •Upward derived sediments with Eu positive anomaly; •Enrichment of MREE points to contamination derived from: • Pyrite slags (Iberian Pyrite Belt); • Phosphogypsum (waste derived from the production of phosphoric acid).
ACKNOWLEDGMENTS This research was partially supported by the Strategic Funding UID/Multi/04423/2013 through national funds provided by FCT and European Regional Development Fund (ERDF). in the framework of the programme PT2020. The current work is part of the FCT project PTDC/QEQ-EPR/1249/2014
