Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Barone, Teresa; Hesse, E.; Seaman, Clara; Baran, Anthony J.; Beck, T.W.; Harris, Marcia L.; Jaques, Paul F.; Lee, T.; Mischler, Steven E.

doi:10.1016/j.apt.2019.05.023

Cited by 12 publications

(5 citation statements)

References 48 publications

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“…As can be seen from Figure 14 , for the two monodisperse Oleic acid droplets, 95.9% and 99.6% of the particles were identified as spherical, respectively, and 94% of the particles were identified as spherical for monodisperse Ethanol droplets. For coal ash samples, the tested particles were mainly other non-spherical particles (accounting for 47.6%), which is consistent with some research conclusions [ 33 ]. In addition, 73.4% of the 4# Silicon dioxide microspheres were identified as spherical, 1.9% as rod-shaped, and 24.7% as other non-spherical particles.…”

Section: Resultssupporting

confidence: 90%

Shape Discrimination of Individual Aerosol Particles Using Light Scattering

Han

Ding

Wang

et al. 2023

Sensors

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We established an experimental apparatus by combining polarized light scattering and angle-resolved light scattering measurement technology to rapidly identify the shape of an individual aerosol particle. The experimental data of scattered light of Oleic acid, rod-shaped Silicon dioxide, and other particles with typical shape characteristics were analyzed statistically. To better study the relationship between the shape of particles and the properties of scattered light, the partial least squares discriminant analysis (PLS-DA) method was used to analyze the scattered light of aerosol samples based on the size screening of particles, and the shape recognition and classification method of the individual aerosol particle was established based on the analysis of the spectral data after nonlinear processing and grouping by particle size with the area under the receiver operating characteristic curve (AUC) as reference. The experimental results show that the proposed classification method has a good discrimination ability for spherical, rod-shaped, and other non-spherical particles, which can provide more information for atmospheric aerosol measurement, and has application value for traceability and exposure hazard assessment of aerosol particles.

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Section: Resultssupporting

confidence: 90%

Shape Discrimination of Individual Aerosol Particles Using Light Scattering

Han

Ding

Wang

et al. 2023

Sensors

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“…However, OPC systematic sizing errors can be minimized by calibration with representative coal dusts. Barone et al [123] applied ray tracing with diffraction on facets and T-matrix theories to adjust the responses of an OPC for submicron and micron size coal particles, respectively. This method accounted for the refractive index and non-spherical shape when computing coal dust diameters from light scattering theory.…”

Section: Optical Particle Sizingmentioning

confidence: 99%

Review of Respirable Coal Mine Dust Characterization for Mass Concentration, Size Distribution and Chemical Composition

et al. 2021

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Respirable coal mine dust (RCMD) exposure is associated with black lung and silicosis diseases in underground miners. Although only RCMD mass and silica concentrations are regulated, it is possible that particle size, surface area, and other chemical constituents also contribute to its adverse health effects. This review summarizes measurement technologies for RCMD mass concentrations, morphology, size distributions, and chemical compositions, with examples from published efforts where these methods have been applied. Some state-of-the-art technologies presented in this paper have not been certified as intrinsically safe, and caution should be exerted for their use in explosive environments. RCMD mass concentrations are most often obtained by filter sampling followed by gravimetric analysis, but recent requirements for real-time monitoring by continuous personal dust monitors (CPDM) enable quicker exposure risk assessments. Emerging low-cost photometers provide an opportunity for a wider deployment of real-time exposure assessment. Particle size distributions can be determined by microscopy, cascade impactors, aerodynamic spectrometers, optical particle counters, and electrical mobility analyzers, each with unique advantages and limitations. Different filter media are required to collect integrated samples over working shifts for comprehensive chemical analysis. Teflon membrane filters are used for mass by gravimetry, elements by energy dispersive X-ray, rare-earth elements by inductively coupled plasma-mass spectrometry and mineralogy by X-ray diffraction. Quartz fiber filters are analyzed for organic, elemental, and brown carbon by thermal/optical methods and non-polar organics by thermal desorption-gas chromatography-mass spectrometry. Polycarbonate-membrane filters are analyzed for morphology and elements by scanning electron microscopy (SEM) with energy dispersive X-ray, and quartz content by Fourier-transform infrared spectroscopy and Raman spectroscopy.

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“…The Cloud Aerosol Spectrometer with Polarization, CAS-POL (Droplet Measurement Technologies, Boulder, CO) is part of the Cloud, Aerosol, and Precipitation Spectrometer (CAPS), which is designed for in-situ atmospheric aerosol sampling and is capable of measuring real-time size distributions of atmospheric aerosols through forward light scattering [ 19 ]. The CAS-POL has been calibrated for use with coal dust and used previously by NIOSH to determine the knockdown efficiencies of water sprays on coal dust [ 15 , 20 , 21 ]. The CAS-POL was used in this study to examine the effect of water curtain configurations on the water droplet profiles.…”

Section: Methodsmentioning

confidence: 99%

Design of a water curtain to reduce accumulations of float coal dust in longwall returns

Seaman

Bugarski

Beck

et al. 2020

International Journal of Mining Science and Technology

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Accumulation of float coal dust (FCD) in underground mines is an explosion hazard that affects all underground coal mine workers. While this hazard is addressed by the application of rock dust, inadequate rock dusting practices can leave miners exposed to an explosion risk. Researchers at the National Institute for Occupational Safety and Health (NIOSH) have focused on developing a water curtain that removes FCD from the airstream, thereby reducing the buildup of FCD in mine airways. In this study, the number and spacing of the active sprays in the water curtain were varied to determine the optimal configuration to obtain peak knockdown efficiency (KE) while minimizing water consumption.

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Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Cited by 12 publications

References 48 publications

Shape Discrimination of Individual Aerosol Particles Using Light Scattering

Shape Discrimination of Individual Aerosol Particles Using Light Scattering

Review of Respirable Coal Mine Dust Characterization for Mass Concentration, Size Distribution and Chemical Composition

Design of a water curtain to reduce accumulations of float coal dust in longwall returns

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