Assessment of marine macroalgae potential for gadolinium removal from contaminated aquatic systems


Gadolinium (Gd) is a rare earth associated with hospital and urban wastewaters due to its application as a contrast agent for magnetic resonance imaging. In this work, the uptake of Gd from contaminated seawater by three living marine macroalgae, Ulva lactuca (Chlorophyta), Fonts spiry:Lis (Phaeophyta) and Gracilaria sp. (Rhodophyta) was studied along 72 h. Surface analysis (FT1R), water content, kinetic modelling, and Gd quantification in seawater and biomass were performed. All species were able to accumulate Gd from seawater with 10, 157, and 500 fig Gd L ',although green and red macroalgac performed better, following the order: green > red > brown. Removal efficiencies reached 85%, corresponding to a bioconceffiration factor of 1700. In more complex solutions that intended to mimic real contaminated environments, namely mixtures with other rare earth elements (Y, La, Cc, Pr, Nkl, Eu, Tb, Dy), and with potentially toxic elements commonly found in wastewaters (Cr, Ni, Cu, Ccl, Hg, Pb), at two salinities (10 and 30), the macroalgac kept its efficiency: 84% and 88% of removal by green and red macroalgae, respectively. Overall, findings evidence that living macroalgac could be a countermeasure to the increasing anthropogenic enrichment- of al observed in the aquatic environment. (C) 2020 Elsevier B.V. All rights reserved.




Environmental Sciences & Ecology


Ferreira, N; Ferreira, A; Viana, T; Lopes, CB; Costa, M; Pinto, J; Soares, J; Pinheiro-Torres, J; Henriques, B; Pereira, E



Bruno Henriques and Claudia B. Lopes benefited froma Research position funded by national funds (OE), through FCT - Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law57/2017, of July 19. Thanks are also due to the financial support to REQUIMTE, CESAM and CIIMAR (UIDB/50006/2020, UIDB/50017/2020+UIDP/50017/2020 and UID/Multi/04423/2019, respectively), to FCT/MEC through national funds, and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020, and to N9VE - Nature, Ocean and Value, Lda, for their cooperation in this work.

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