semelemental mapping ofurban particles
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SEM Elemental Mapping ofUrban Particles
ABSTRACT
Elemental mapping with energy-dispersive x-ray spectroscopy (EDX) associated with scanning
electron microscopy is highly useful for studying internally-mixed atmospheric particles.
Presented is a study of individual particles from urban airsheds and the analytical challenges in
qualitatively determining the composition and origin of heterogeneous urban-air particles from
high-resolution elemental maps. Coarse-mode particles were taken from samples collected in
three U.S. cities: Atlanta, Los Angeles, and Seattle. Elemental maps distinguished particles with
heterogeneously-mixed phases from those with homogeneously-mixed phases that also contained
inclusions or surface adducts. Elemental mapping at low and high beam energies, along with
imaging at an oblique angle helped to classify particles by origin. The impact of particle shape
on x-ray microanalysis was demonstrated by having the beam enter the particle at 2: 52° from
normal. Potential misinterpretations of particle composition due to artifacts in the elemental
maps were minimized by tilt imaging to reveal particle surface roughness and depth, mapping at
low beam energies, noting the position of the EDX detector in the map field, and assessing
differences in the mass absorption coefficients of the particle's major elements to anticipate x-ray
self-absorption.
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