Determining the effective density of airborne nanoparticles using multiple charging correction in a tandem DMA/ELPI setup

Bau, Sébastien; Bémer, Denis; Grippari, Florence; Appert-Collin, Jean-Christophe; Thomas, Dominique

doi:10.1007/s11051-014-2629-2

Cited by 13 publications

(7 citation statements)

References 40 publications

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“…The size-resolved MAC was calculated using the Mie scattering model (Bohren and Huffman, 2007). Based on the Mie scattering theory, MAC values vary for different aerosol core diameter and different total diameter.…”

Section: Transform the Size-resolved σ Abs Into Bcmsdmentioning

confidence: 99%

Role of black carbon mass size distribution in the direct aerosol radiative forcing

et al. 2019

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Large uncertainties exist when estimating radiative effects of ambient black carbon (BC) aerosol. Previous studies about the BC aerosol radiative forcing mainly focus on the BC aerosols' mass concentrations and mixing states, while the effects of BC mass size distribution (BCMSD) were not well considered. In this paper, we developed a method of measuring the BCMSD by using a differential mobility analyzer in tandem with an Aethalometer. A comprehensive method of multiple charging corrections was proposed and implemented in measuring the BCMSD. Good agreement was obtained between the BC mass concentration integrated from this system and that measured in the bulk phase, demonstrating the reliability of our proposed method. Characteristics of the BCMSD and corresponding radiative effects were studied based on a field measurement campaign conducted in the North China Plain by using our own measurement system. Results showed that the BCMSD had two modes and the mean peak diameters of the modes were 150 and 503 nm. The BCMSD of the coarser mode varied significantly under different pollution conditions with peak diameter varying between 430 and 580 nm, which gave rise to significant variation in aerosol bulk optical properties. The direct aerosol radiative forcing was estimated to vary by 8.45 % for different measured BCMSDs of the coarser mode, which shared the same magnitude with the variation associated with assuming different aerosol mixing states (10.5 %). Our study reveals that the BCMSD as well as its mixing state in estimating the direct aerosol radiative forcing matters. Knowledge of the BCMSD should be fully considered in climate models.

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Section: Transform the Size-resolved σ Abs Into Bcmsdmentioning

confidence: 99%

Role of black carbon mass size distribution in the direct aerosol radiative forcing

et al. 2019

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“…A given electrical mobility diameter was selected from a polydisperse aerosol of DEHS droplets (AGK 2000, Palas), using a DMA Vienna Type selector (Grimm, Q sheath D 3 L/min, Q aerosol D 0.3 L/min). Assuming that the proportion of multiply charged particles was negligible (see, e.g., Bau et al 2012), this results in the production of monodisperse aerosols with a given electrical mobility diameter, and a corresponding geometric standard deviation typically smaller than 1.05, as described in previous studies where a model for the DMA transfer function was applied (Bau et al 2014). Ten aerodynamic diameter values between 0.14 and 0.95 mm were used in this series of experiments.…”

Section: Test Rig For the Generation Of Monodisperse Submicronic Aeromentioning

confidence: 99%

Physical performances and kinetics of evaporation of the CIP 10-M personal sampler's rotating cup containing aqueous or viscous collection fluid

Simon

Bau

Boivin

et al. 2016

Aerosol Science and Technology

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The CIP 10-M personal sampler measures worker exposure to airborne particles by collecting particles in a rotating metal cup containing a few milliliters of a collection fluid. This device is mainly used to sample microorganisms or microbial components to measure bioaerosol concentrations in various occupational environments. Aqueous liquids are generally used, but their rapid evaporation limits the duration of sampling; alternative collection fluids could alleviate this problem. Indeed, the particle-collection efficiency of the rotating cup has not been extensively studied, and the only data available relate to a discontinued model. This study aimed to measure the collection efficiency of the current rotating cup model containing an aqueous (water) or viscous (ViaTrap mineral oil) collection fluid. The kinetics of evaporation confirmed that ViaTrap does not evaporate, making 8-h sampling campaigns in constant volumes feasible. Particles with a wide range of aerodynamic diameters (between around 0.1 and 10 mm) were produced using various test rigs and mono-or polydisperse test aerosols. Both new and older cup models performed similarly, with a collection efficiency of >80% for larger particles (aerodynamic diameters >2.8 mm), progressively decreasing to around 50% for aerodynamic diameters of 2.1 mm; with aerodynamic diameters of <1 mm, the collection efficiency was generally <10%. In physical terms, collection efficiency was unaffected by the type (aqueous or viscous) or volume (between 0 and 3 mL) of collection fluid used. Bias maps indicated that the inhalable fraction may be underestimated in occupational settings, particularly with aerosols mainly composed of particles with aerodynamic diameters of less than around 3 mm. EDITORTiina Reponen

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“…Therefore, mass distribution and particle density play pivotal roles in the study of associated health effects. However, obtaining measurements of the morphology or density of aerosol particles in the environment is not easy (Bau et al, 2014;De-Carlo et al, 2004), and particles in an ambient environment are generally irregular and nonspherical. In this regard, Liu et al (2013) demonstrated that the morphological parameter of a fractal soot particle, namely the fractal dimension (D f ), could affect the particle's radiative properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature, pressure, and carrier gases on the performance of an aerosol particle mass analyser

et al. 2018

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Effective density is a crucial parameter used to predict the transport behaviour and fate of particles in the atmosphere, and to measure instruments used ultimately in the human respiratory tract (Ristimäki et al., 2002). The aerosol particle mass analyser (APM) was first proposed by Ehara et al. (1996) and is used to determine the effective density of aerosol particles. A compact design (Kanomax APM-3601) was subsequently developed by Tajima et al. (2013). Recently, a growing number of field studies have reported application of the APM, and experimental schemes using the differential mobility analyser alongside the APM have been adopted extensively. However, environmental conditions such as ambient pressure and temperature vary with the experimental location, and this could affect the performance of the APM. Gas viscosity and Cunningham slip factors are parameters associated with temperature and pressure and are included in the APM's classification performance parameter: λ. In this study, the effects of temperature and pressure were analysed through theoretical calculation, and the influence of varying carrier gas was experimentally evaluated. The transfer function and APM operational region were further calculated and discussed to examine their applicability. Based on the theoretical analysis of the APM's operational region, the mass detection limits are changed with the properties of carrier gases under a chosen λ value. Moreover, the detection limit can be lowered when the pressure is reduced, which implies that performance may be affected during field study. In experimental evaluation, air, oxygen, and carbon dioxide were selected to atomize aerosols in the laboratory with the aim of evaluating the effect of gas viscosity on the APM's performance. Using monodisperse polystyrene latex (PSL) spheres with nominal diameters of 50 and 100 nm, the classification performance of the APM was slightly varied with carrier gases, while the classification accuracy was consistently within 10 %.

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Determining the effective density of airborne nanoparticles using multiple charging correction in a tandem DMA/ELPI setup

Cited by 13 publications

References 40 publications

Role of black carbon mass size distribution in the direct aerosol radiative forcing

Role of black carbon mass size distribution in the direct aerosol radiative forcing

Physical performances and kinetics of evaporation of the CIP 10-M personal sampler's rotating cup containing aqueous or viscous collection fluid

Effects of temperature, pressure, and carrier gases on the performance of an aerosol particle mass analyser

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