In:
Proceedings, annual meeting, Electron Microscopy Society of America, Cambridge University Press (CUP), Vol. 51 ( 1993-08-01), p. 1124-1125
Abstract:
Collection and preservation strategies and a routine analysis procedure were developed for elemental analysis of individual atmospheric particles using a scanning-transmission electron microscope (STEM) equipped with a super ultra-thin window energy dispersive x-ray detector. These techniques were applied to airborne particles collected at Meadview, AZ, a remote site just downriver of the Grand Canyon. Collection, preservation and beam damage issues of concern in electron microscopic analysis of atmospheric particles will be discussed. Aerosol compositions are usually determined from bulk particle measurements, and it is assumed that compounds are either internally mixed (all present in each particle) or externally mixed (particles each contain a single compound). Insight into the microscopic mixing characteristics of atmospheric aerosols will ultimately further the understanding of atmospheric particle transformation, visibility degradation, and the fate of airborne pollutants. Particles were collected in the summer of 1992 in three size fractions (1.0-0.5 μm, 0.5-0.26 μm, 0.26-0.12 μm in diameter) using a Hering Low Pressure Impactor and a 250 Å thick silver film substrate supported by a silver TEM grid.
Type of Medium:
Online Resource
ISSN:
0424-8201
,
2690-1315
DOI:
10.1017/S0424820100151453
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
1993
SSG:
11
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