Article
Behaviour of Au-citrate nanoparticles in seawater and accumulation in bivalves at environmentally relevant concentrations
Author/s | Rojas Ruiz, Teresa Cristina
García Negrete, Carlos Andrés Blasco Moreno, Julián Hampel, Miriam Lapresta Fernández, Alejandro Jiménez de Haro, María del Carmen Fernández Camacho, Asunción Soto, M. Volland, M. |
Publication Date | 2013-03 |
Deposit Date | 2018-05-09 |
Published in |
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Abstract | The degree of aggregation and/or coalescence of Au-citrate nanoparticles (AuNPs, mean size 21.5 ± 2.9 nm), after delivery in simulated seawater, are shown to be concentration-dependent. At low concentrations no coalescence ... The degree of aggregation and/or coalescence of Au-citrate nanoparticles (AuNPs, mean size 21.5 ± 2.9 nm), after delivery in simulated seawater, are shown to be concentration-dependent. At low concentrations no coalescence and only limited aggregation of primary particles were found. Experiments were performed in which the marine bivalve (Ruditapes philippinarum) was exposed to AuNPs or dissolved Au and subsequently, bivalve tissues were studied by Scanning and Transmission Electron Microscopy and chemical analyses. We show that the bivalve accumulates gold in both cases within either the digestive gland or gill tissues, in different concentrations (including values of predicted environmental relevance). After 28 days of exposure, electron-dense deposits (corresponding to AuNPs, as proven by X-ray microanalysis) were observed in the heterolysosomes of the digestive gland cells. Although non-measurable solubility of AuNPs in seawater was found, evidence is presented of the toxicity produced by Au3+ dissolved species (chloroauric acid solutions) and its relevance is discussed. |
Funding agencies | Junta de Andalucía European Union (UE). FP7 |
Project ID. | PE2009‐FQM‐4554
TEP‐217 CT‐REGPOT2011‐1‐285895 |
Citation | Rojas Ruiz, T.C., García Negrete, C.A., Blasco Moreno, J., Hampel, M., Lapresta Fernández, A., Jiménez de Haro, M.d.C.,...,Volland, M. (2013). Behaviour of Au-citrate nanoparticles in seawater and accumulation in bivalves at environmentally relevant concentrations. Environmental Pollution, 174, 134-141. |
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