Kabir Rishi , Orthodoxia Zervaki , Bon-Ki Ku , Nicholas Pugh , Chen Wang , Vasileia Vogiazi , Pramod Kulkarni
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引用次数: 0
Abstract
Infrared absorption spectroscopy is commonly used to quantify chemicals in the particulate phase for environmental and occupational aerosol exposure measurements. Unlike gas-phase analyte quantification, the analytical figures of merit depend on the characteristics of the particulate phase, in particular the aerosol size distribution. In the Mie scattering regime, where the particle size is comparable to the incident infrared wavelength, the bias in analyte quantification can depend on particle size. This error may depend on how well the size distribution of the aerosol matches with that of the reference material used to calibrate the method. While the impact of packing densities, and spectral interferences from the substrate and other minerals in the aerosol has been assessed in previous work, the impact of aerosol size distribution has not been explored. In this work, the Lorenz-Mie solution to Maxwell's equation was used to determine the bias in mass quantification of quartz in typical occupational aerosols for which the IR method is commonly used. Our experimental findings were benchmarked with the Lorenz-Mie solution using model spherical polystyrene particles. Practical deviations due to the asymmetric shape of quartz particles size-fractionated using different cascade impactors are presented and compared with literature studies on quartz aerosols. The expected bias in analyte quantification using different quartz standard reference materials relative to NIST SRM 1878a was assessed. The implications on quartz quantification due to differences in aerosol size distribution at different locations in the coal mine, granite quarries, and during construction activities such as stone finishing and grinding are presented and discussed.
期刊介绍:
Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences.
The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics:
1. Fundamental Aerosol Science.
2. Applied Aerosol Science.
3. Instrumentation & Measurement Methods.