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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2013

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Improved identification of transition metals in airborne aerosols by SEM-EDX combined backscattered and secondary electron microanalysis

Anno di pubblicazione: 2013

Formato: Elettronico

Autori: Pietrodangelo A.; Pareti S.; Perrino C.

Affiliazioni autori: C.N.R. Institute of Atmospheric Pollution Research, Via Salaria, Km 29, 300, Monterotondo, Rome, 00015, Italy

Autori CNR:

  • SALVATORE PARETI
  • CINZIA PERRINO
  • ADRIANA PIETRODANGELO

Lingua: inglese

Abstract: The SEM EDX backscattered electron (BSE) atomic number contrast has been largely used in this work, in combination with conventional secondary electron microanalysis, to investigate the presence of metal particles in airborne particulate collected at three sites (industrial, residential, and rural background) in the Po Valley (Italy). Individual particle x-ray microanalysis was used for this aim. In many cases, the presence of metal particles was not evident by secondary electron imaging and it was instead revealed by BSE detection. Metal particles were observed either as isolated (not clustered to other particles), or gathered together (homogeneous clusters). In addition, the BSE microanalysis put on evidence two main types of association of metals to other particulate components: heterogeneous clusters and metals embedded or enclosed in other materials. In this study, the first association (heterogeneous clusters) was observed mostly between Fe-bearing metallic particles and soot aggregates (or other carbonaceous particles) and it was found in the particulate matter (PM) of all studied sites. The second association, conversely, seems to be characterized by more selective relationships between composition/size of metal particles and type of other particulate components. These associations could be evidenced only when using the BSE Z-contrast and mainly concern three cases: (1) unusual silicate-carbonate mixed aggregates were observed at the industrial site only. In these aggregates, embedded Mn, Cr, Co, Bi, W, and Zr fine particles were selectively observed. (2) Ni and V rich ultrafine particles were only observed as embedded particles in the surface structure of carbon cenospheres. (3) Pb or Pb-Zn bearing fine and ultrafine particles were largely detected only in oxygenated organic aerosols in the ultrafine PM. © 2013 Springer-Verlag Berlin Heidelberg.

Lingua abstract: inglese

Pagine da: 4023

Pagine a: 4031

Rivista:

Environmetal science and pollution research international Springer
Paese di pubblicazione: Germania
Lingua: inglese
ISSN: 1614-7499

Numero volume: 21

Numero fascicolo: 6

DOI: 10.1007/s11356-013-2261-1

Referee: Sì: Internazionale

Stato della pubblicazione: Published version

Indicizzato da: Scopus [2-s2.0-84895861233]

Parole chiave:

  • Atomic number contrast
  • Particulate matter
  • Po Valley
  • SEM EDX
  • Source identification
  • Trace metals

URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-84895861233&partnerID=q2rCbXpz

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