Comparison and Combination of Aerosol Size Distributions Measured with a Low Pressure Impactor, Differential Mobility Particle Sizer, Electrical Aerosol Analyzer, and Aerodynamic Particle Sizer

Peters, Thomas M.; Chein, Hung Min; Lundgren, Dale A.; Keady, Patricia B.

doi:10.1080/02786829308959647

Cited by 45 publications

(25 citation statements)

References 7 publications

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“…where D ae is aerodynamic diameter, D VE is volume equivalent diameter, C ae is slip correction factor for aerodynamic diameter, C VE is slip correction factor for volume equivalent diameter, ρ p is particle density (in g/cm 3 ), and χ is dynamic shape factor (Peters et al 1993). For the ambient particles used in this study, ρ p was assumed to be 1.7 g/cm 3 (Babich et al 2000), χ was assumed to be 1.0, and the mobility equivalent diameter measured by the SMPS was assumed to equal D VE .…”

Section: Discussionmentioning

confidence: 99%

Continuous Measurements of Ambient Particle Deposition in Human Subjects

Montoya

Lawrence²,

Murthy³

et al. 2004

Aerosol Science and Technology

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The total deposition fraction (TDF) of fine and ultrafine aerosols was measured in a group of six healthy adults exposed to polydisperse ambient aerosols in Boston. Fifteen repeated inhalationexhalation cycles were conducted during a given exposure session. Deposition efficiency for particles with aerodynamic diameter ranging from 63.5 to 2045 nm was determined using the average concentration of inhaled and exhaled particles measured during these cycles. Deposition efficiencies ranged from 7.3 ± 18.7% (240-275 nm) to 98.6 ± 28.1% (1545-2045 nm). Subjects exhibited similar deposition patterns with minimum efficiencies between 200-400 nm. Results from ANOVA and mixed-model regression analyses showed significant differences ( p < 0.05) in particle deposition efficiency by particle size as well as among the subjects. Deposition efficiencies varied most among the subjects for particles between 100 and 1000 nm in size. A comparison with the ICRP model showed good agreement, with best agreement for male subjects and particle sizes <400 nm.

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Section: Discussionmentioning

confidence: 99%

Continuous Measurements of Ambient Particle Deposition in Human Subjects

Montoya

Lawrence²,

Murthy³

et al. 2004

Aerosol Science and Technology

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“…A scanning mobility particle sizer (SMPS, model 3080, TSI Inc., Shoreview, MN; airflow = 0.3 Lpm) was used to count particles from 15 to 500 nm, and an aerodynamic particle sizer (APS, model 3321, TSI Inc. Shoreview, MN) was used to count particles from 0.5 to 2 μm. For the APS data, each particle size interval was converted from aerodynamic diameter to mobility equivalent diameter following Peters et al (21) The APS inlet was modified so that the 1 Lpm sample entered directly into the aerosol inlet at 1 Lpm and the 4 Lpm sheath air, which is internally filtered, was left open to room air. A mass flow controller (model GFC37, Aalborg Instruments & Controls Inc., New York, NY) was used to maintain a constant flow rate of 2.5 Lpm drawn through the impactor with a vacuum pump (model 4F740A, Gast Manufacturing Inc., Benton Harbor, MI).…”

Section: Evaluation Of the Impactor Performancementioning

confidence: 99%

A Personal Nanoparticle Respiratory Deposition (NRD) Sampler

Cena

Anthony

Peters

2011

Environ. Sci. Technol.

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A lightweight (60 g), personal nanoparticle respiratory deposition (NRD) sampler was developed to selectively collect particles smaller than 300 nm similar to their typical deposition in the respiratory tract. The sampler operates at 2.5 Lpm and consists of a respirable cyclone fitted with an impactor and a diffusion stage containing mesh screens. The cut-point diameter of the impactor was determined to be 300 nm with a sharpness σ = 1.53. The diffusion stage screens collect particles with an efficiency that matches the deposition efficiency of particles smaller than 300 nm in the respiratory tract. Impactor separation performance was unaffected by loading at typical workplace levels (p-value = 0.26). With chemical analysis of the diffusion media, the NRD sampler can be used to directly assess exposures to nanoparticles of a specific composition apart from other airborne particles. The pressure drop of the NRD sampler is sufficiently low to permit its operation with conventional, belt-mounted sampling pumps.

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“…Assuming that the mobility equivalent diameter is equal to the equivalent volume diameter (Kasper, 1982), the conversion was made using (Peters, Chein, & Lundgren, 1993)…”

Section: Particle Sampling and Monitoring Systemmentioning

confidence: 99%