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. 2012 Mar 20;46(6):3101-9.
doi: 10.1021/es203435n. Epub 2012 Mar 1.

Use of X-ray absorption spectroscopy to speciate manganese in airborne particulate matter from five counties across the United States

Saugata Datta  1 , Ana M Rule, Jana N Mihalic, Steve N Chillrud, Benjamin C Bostick, Juan P Ramos-Bonilla, Inkyu Han, Lisa M Polyak, Alison S Geyh, Patrick N Breysse
Affiliations

Use of X-ray absorption spectroscopy to speciate manganese in airborne particulate matter from five counties across the United States

Saugata Datta et al. Environ Sci Technol. .

Abstract

The purpose of this study is to characterize manganese oxidation states and speciation in airborne particulate matter (PM) and describe how these potentially important determinants of PM toxicity vary by location. Ambient PM samples were collected from five counties across the US using a high volume sequential cyclone system that collects PM in dry bulk form segregated into "coarse" and "fine" size fractions. The fine fraction was analyzed for this study. Analyses included total Mn using ICP-MS and characterization of oxidation states and speciation using X-ray absorption spectroscopy (XAS). XAS spectra of all samples and ten standard compounds of Mn were obtained at the National Synchrotron Light Source. XAS data was analyzed using Linear Combination Fitting (LCF). Results of the LCF analysis describe differences in composition between samples. Mn(II) acetate and Mn(II) oxide are present in all samples, while Mn(II) carbonate and Mn(IV) oxide are absent. To the best of our knowledge, this is the first paper to characterize Mn composition of ambient PM and examine differences between urban sites in the US. Differences in oxidation state and composition indicate regional variations in sources and atmospheric chemistry that may help explain differences in health effects identified in epidemiological studies.

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Figures

Figure 1
Figure 1
Spectra of the 10 reference standard materials used for linear combination fitting (LCF) analysis. Individual spectra are offset for presentation purposes.
Figure 2
Figure 2
Sample spectrum and linear combination fitting of each of the samples from five counties and SRM 1648a, along with R-factor and Reduced Chi-Square values for individual fit. Refer to figure 3 for percent contribution of each standard spectrum to each of the fits.
Figure 3
Figure 3
Percent contributions of each standard spectrum to the fit obtained for the five counties and SRM 1648a, obtained from LCF analysis.
See this image and copyright information in PMC

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