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Nanospectroscopy Captures Nanoscale Compositional Zonation in Barite Solid Solutions.
Ling, Florence T; Hunter, Heather A; Fitts, Jeffrey P; Peters, Catherine A; Acerbo, Alvin S; Huang, Xiaojing; Yan, Hanfei; Nazaretski, Evgeny; Chu, Yong S.
Afiliación
  • Ling FT; Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, 08544, USA.
  • Hunter HA; Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, 08544, USA.
  • Fitts JP; Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, 08544, USA.
  • Peters CA; Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, 08544, USA. cap@princeton.edu.
  • Acerbo AS; Center for Advanced Radiation Sources (CARS), University of Chicago, Chicago, IL, 60637, USA.
  • Huang X; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA.
  • Yan H; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA.
  • Nazaretski E; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA.
  • Chu YS; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA.
Sci Rep ; 8(1): 13041, 2018 Aug 29.
Article en En | MEDLINE | ID: mdl-30158629
Scientists have long suspected that compositionally zoned particles can form under far-from equilibrium precipitation conditions, but their inferences have been based on bulk solid and solution measurements. We are the first to directly observe nanoscale trace element compositional zonation in <10 µm-sized particles using X-ray fluorescence nanospectroscopy at the Hard X-ray Nanoprobe (HXN) Beamline at National Synchrotron Light Source II (NSLS-II). Through high-resolution images, compositional zonation was observed in barite (BaSO4) particles precipitated from aqueous solution, in which Sr2+ cations as well as HAsO42- anions were co-precipitated into (Ba,Sr)SO4 or Ba(SO4,HAsO4) solid solutions. Under high salinity conditions (NaCl ≥ 1.0 M), bands contained ~3.5 to ~5 times more trace element compared to the center of the particle formed in early stages of particle growth. Quantitative analysis of Sr and As fractional substitution allowed us to determine that different crystallographic growth directions incorporated trace elements to different extents. These findings provide supporting evidence that barite solid solutions have great potential for trace element incorporation; this has significant implications for environmental and engineered systems that remove hazardous substances from water.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2018 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2018 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido