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Malek, Md Abdul,Kim, BoWha,Jung, Hae-Jin,Song, Young-Chul,Ro, Chul-Un American Chemical Society 2011 ANALYTICAL CHEMISTRY - Vol.83 No.20
<P>Our previous work on the speciation of individual mineral particles of micrometer size by the combined use of attenuated total reflectance FT-IR (ATR-FT-IR) imaging and a quantitative energy-dispersive electron probe X-ray microanalysis technique (EPMA), low-<I>Z</I> particle EPMA, demonstrated that the combined use of these two techniques is a powerful approach for looking at the single-particle mineralogy of externally heterogeneous minerals. In this work, this analytical methodology was applied to characterize six soil samples collected at arid areas in China, in order to identify mineral types present in the samples. The six soil samples were collected from two types of soil, i.e., loess and desert soils, for which overall 665 particles were analyzed on a single particle basis. The six soil samples have different mineralogical characteristics, which were clearly differentiated in this work. As this analytical methodology provides complementary information, the ATR-FT-IR imaging on mineral types, and low-Z particle EPMA on the morphology and elemental concentrations, on the same individual particles, more detailed information can be obtained using this approach than when either low-Z particle EPMA or ATR-FT-IR imaging techniques are used alone, which has a great potential for the characterization of Asian dust and mineral dust particles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2011/ancham.2011.83.issue-20/ac201956h/production/images/medium/ac-2011-01956h_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac201956h'>ACS Electronic Supporting Info</A></P>
Malek, Md Abdul,Eom, Hyo-Jin,Hwang, Heejin,Hur, Soon Do,Hong, Sungmin,Hou, Shugui,Ro, Chul-Un Elsevier 2019 Chemical geology Vol.504 No.-
<P><B>Abstract</B></P> <P>In this study, insoluble microparticles from four discrete layers of ice-cores drilled out from the East Rongbuk glacier of the Himalayas were characterized on a single particle basis by scanning electron microscopy coupled with energy dispersive X-ray spectrometry (SEM/EDX) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) imaging. The combined application of the two single particle analytical techniques for the analysis of the same individual particles provided complementary information, i.e., their elemental compositions and morphology by SEM/EDX and their molecular species, functional groups, and crystallinity by ATR-FTIR imaging, which is crucial for the definite identification of the mineral species including their polymorphs. The results showed that the integrated signatures of volcanic ash (VA), involving their mineralogical characteristics for silica polymorphs, vitreous nature of silica and silicate particles, chemical heterogeneity within the micrometer sized particles, and unique morphology, can be used to clearly differentiate micrometer sized VA from the mineral dust of a soil origin on a single-particle basis. The different mineralogical characteristics among the volcanic samples would be due to their association with different volcanic eruptions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Single particle mineralogy of microparticles from ice-cores </LI> <LI> Combined use of SEM/EDX and ATR-FTIR imaging for analysis of the same single particles </LI> <LI> Integrated volcanic ash signatures observed for cryptotephra ice-core samples </LI> <LI> Diverse silica polymorph and vitreous silica contents for ice-core samples </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>