Speciation of Individual Mineral Particles of Micrometer Size by the Combined Use of Attenuated Total Reflectance-Fourier Transform-Infrared Imaging and Quantitative Energy-Dispersive Electron Probe X-ray Microanalysis Techniques

摘要

Our previous work demonstrated for the first time thenpotential of the combined use of two techniques, attenuatedntotal reflectance FT-IR (ATR-FT-IR) imaging and anquantitative energy-dispersive electron probe X-ray microanalysis,nlow-Z particle EPMA, for the characterizationnof individual aerosol particles. In this work, the speciationnof mineral particles was performed on a single particlenlevel for 24 mineral samples, including kaolinite, montmorillonite,nvermiculite, talc, quartz, feldspar, calcite,ngypsum, and apatite, by the combined use of ATR-FT-IRnimaging and low-Z particle EPMA techniques. These twonsingle particle analytical techniques provide complementaryninformation, the ATR-FT-IR imaging on mineral typesnand low-Z particle EPMA on the morphology and elementalnconcentrations, on the same individual particles. Thisnwork demonstrates that the combined use of the twonsingle particle analytical techniques can powerfully characterizenexternally heterogeneous mineral particle samplesnin detail and has great potential for the characterizationnof airborne mineral dust particles.