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Behaviour of Au-citrate nanoparticles in seawater and accumulation in bivalves at environmentally relevant concentrations

AuthorsGarcía-Negrete, C. A. ; Blasco, Javier; Volland, Moritz; Rojas, T. Cristina; Hampel, Miriam ; Lapresta-Fernández, A. ; Jiménez de Haro, María del Carmen ; Soto, M.; Fernández-Camacho, A.
KeywordsGold nanoparticles
Chloroauric acid
Sea water
Bivalve accumulation
Electron microscopy
Ruditapes philippinarum
Cellular location
Issue DateMar-2013
CitationEnvironmental Pollution Volume 174: 134–141 (2013)
AbstractThe 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.
Description8 páginas, 1 tabla, 5 figuras
Publisher version (URL)http://dx.doi.org/10.1016/j.envpol.2012.11.014
Appears in Collections:(ICMS) Artículos
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