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Natural Radionuclides, Rare Earths and Heavy Metals Transferred to the Wild Vegetation Covering a Phosphogypsum Stockpile at Barreiro, Portugal

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Abstract

In Portugal, the industrial production of phosphate fertilizers, has been dealing with a specific raw material—north African phosphate rock—with a high content of trace metals and natural radioactive elements mainly from the 238U decay series. A disabled phosphate plant located in the vicinity of the river Tejo estuary has produced phosphoric acid for several decades (1950–1989) and dumped tons of phosphogypsum (PG) on retention lagoons, formerly decanted and deposited into a stockpile. This paper deals with the assessment of radionuclides, rare earth elements (REEs) and heavy metals transfer to plants (fam. Plantaginaceae, Plantago sp.) and mosses (fam. Bryaceae, Bryum sp.) growing naturally on the PG pile. In Plantago sp., the concentration ratio (CR, plant tissue/PG) was 0.187 for 226Ra and 0.293 for 210Pb. The translocation factor (TF, aerial parts/roots) was 0.781 for 226Ra and 0.361 for 210Pb. In contradiction to the high CR, the leachability of 226Ra from PG was low, lower than 2%. The results confirmed the role of mosses as biomonitors. A high quantity of contaminants collected in its biomass confirmed the hypothesis of their significant transport by air and rain water. High concentrations of heavy metals (As, Cd, Zn, W) in samples collected on the stockpile are an evidence of their transport from former industrial zones in the surroundings and present even more important risk for public health and environment than natural radionuclides and REEs from the PG stockpile.

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Acknowledgments

The C2TN authors would like to thank the enterprise Baía do Tejo S.A., owner of the Barreiro PG stockpile, for kindly allowing sampling in its premises. They also gratefully acknowledge the Fundação para a Ciência e Tecnologia (FCT) support through the UID/Multi/04349/2013 project. Finally, they wish to express their gratitude to the Laboratory of Nuclear Engineering (LEN) and the staff of the Portuguese Research Reactor (RPI) of IST for their assistance with the neutron irradiation, and the devoted collaboration of LPSR gamma spectrometry and liquid scintillation technicians Mrs. Lidia Silva and Mr. João Abrantes.

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Authors and Affiliations

  1. Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico (IST), Universidade de Lisboa, E.N. 10 ao km 139.7, 2695-066, Bobadela LRS, Portugal

    José Alberto Gil Corisco, Jan Mihalík, Maria José Madruga, Maria Isabel Prudêncio, Rosa Marques, Marta Santos & Mário Reis

  2. Laboratório de Proteção e Segurança Radiológica (LPSR), Instituto Superior Técnico, Universidade de Lisboa, E.N. 10 ao km 139.7, 2695-066, Bobadela LRS, Portugal

    José Alberto Gil Corisco, Maria José Madruga, Marta Santos & Mário Reis

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  1. José Alberto Gil Corisco
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  2. Jan Mihalík
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  3. Maria José Madruga
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  4. Maria Isabel Prudêncio
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Correspondence to José Alberto Gil Corisco.

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Corisco, J.A.G., Mihalík, J., Madruga, M.J. et al. Natural Radionuclides, Rare Earths and Heavy Metals Transferred to the Wild Vegetation Covering a Phosphogypsum Stockpile at Barreiro, Portugal. Water Air Soil Pollut 228, 235 (2017). https://doi.org/10.1007/s11270-017-3413-6

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