39 Citations (Scopus)

Abstract

Nanoparticles (NPs) are ubiquitous in the atmosphere. Because of their small sizes, they can travel deeply into the lungs and other parts of the body. Many are highly reactive which, combined with their large surface areas, means they can seriously affect human health. Their occurrences in the atmosphere and their biological effects are not well-understood. We focus on NPs that were either free-floating or hosted within large aerosol particles (aerodynamic diameter 50-300 nm) and consist of or contain transition or post-transition metals (m-NPs). The samples were collected from ambient air above Mexico City (MC). We used transmission electron microscopy to measure their sizes and compositions. More than half of the 572 m-NPs that we analyzed contain two or more metals, and Fe, Pb, or Zn occurs in more than 60%. Hg occurs in 21% and is especially abundant in free-floating m-NPs. We find that m-NPs are common in polluted air such as in the MC area and, by inference, presumably other megacities. The range and variety of compositions of m-NPs thatwe encountered, whetherfree-floating or hosted within larger aerosol particles, indicate the complicated occurrences that should be considered when evaluating the health effects of m-NPs in complex urban areas.

Original languageEnglish (US)
Pages (from-to)2299-2304
Number of pages6
JournalEnvironmental Science and Technology
Volume44
Issue number7
DOIs
StatePublished - Apr 1 2010

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Bearings (structural)
Metals
Nanoparticles
metal
Aerosols
Health
aerosol
megacity
nanoparticle
city
atmosphere
transition element
Air
Chemical analysis
ambient air
aerodynamics
Transition metals
transmission electron microscopy
Aerodynamics
surface area

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Hosted and free-floating metal-bearing atmospheric nanoparticles in Mexico city. / Adachi, Kouji; Buseck, P R.

In: Environmental Science and Technology, Vol. 44, No. 7, 01.04.2010, p. 2299-2304.

Research output: Contribution to journalArticle

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