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Citation link: https://doi.org/10.26092/elib/3156

Publisher DOI: https://doi.org/10.1016/j.marchem.2019.03.008
Duran-Toro_Pichler_Rezwan_et_al_Amorphous arsenic sulfide nanoparticles_2019_accepted-version.pdf
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Amorphous arsenic sulfide nanoparticles in a shallow water hydrothermal system


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Authors: Durán Toro, Vicente  
Price, Roy 
Maas, Michael  
Brombach, Christoph-Cornelius 
Pichler, Thomas  
Rezwan, Kurosch  
Bühring, Solveig  
Abstract: 
Hydrothermal fluids can contain trace elements such as arsenic (As), which are toxic to surrounding biota. In these kind of fluids, the bioavailability and biotransformation of As have been investigated but so far the ratio of total soluble As (<200 nm) versus the amount of As contained in a nanoparticulate phase has not been reported. Here, for the first time, the presence of As in the nanoparticulate fraction (between 200 and 20 nm) is described for arsenic-rich hydrothermal fluids in a marine shallow-water hydrothermal system. Samples of diffusively venting hydrothermal fluids, pore-water and seawater were collected in the hydrothermal system located in Paleochori Bay, Milos Island (Greece), and the fraction between 200 and 20 nm (As200-20) was studied. Up to 38% of the soluble arsenic was present within the As200-20 fraction in pore fluids, 10 to 20% in hydrothermal fluids and 5% in seawater. Identification and characterization of particles in hydrothermal fluid, pore-water and seawater was performed by scanning electron microscopy coupled to energy dispersive X-ray spectroscopy (SEM-EDX), transmission electron microscopy (TEM) with selected area electron diffraction (SAED) and dynamic light scattering (DLS). The particles are of spherical morphology with a polydisperse size distribution (PDI: 0.37) and diameters close to 100 nm. EDX studies confirmed a chemical composition rich in As and S. The SAED pattern revealed absence of a crystal phase indicating the presence of an amorphous arsenic sulfide material. These results bring into discussion the role of the nanoparticulate fraction for As dispersion, bioavailability, and potentially harmful effects in marine coastal ecosystems.
Keywords: Arsenic; Nanoparticles; Hydrothermal vents; Milos
Issue Date: 23-Apr-2019
Publisher: Elsevier Science
Project: VDT (Programa de Capital Humano Avanzado, BECAS-Chile 
DFG Emmy Noether Program 
DFG grant 
Grant number: CONICYT, 72160570 Res. Convenio 7359/2015
BU 2606/1-1 to SIB
HE 7594/1-1
Journal/Edited collection: Marine Chemistry 
Start page: 25
End page: 36
Volume: 211
Type: Artikel/Aufsatz
ISSN: 1872-7581
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/3156
URN: urn:nbn:de:gbv:46-elib81229
Institution: Universität Bremen 
Faculty: Fachbereich 05: Geowissenschaften (FB 05) 
Institute: Fachgebiet Geochemie und Hydrogeologie 
Appears in Collections:Forschungsdokumente

  

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