Hygroscopic Growth of Assorted Indoor Aerosols

Dua, S.K.; Hopke, Philip K.

doi:10.1080/02786829608965360

Cited by 42 publications

(21 citation statements)

References 19 publications

(16 reference statements)

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“…In our study, we performed the cooking experiments by frying sausages with sunflower oil and toasting bread. This result is consistent with Dua and Hopke (1996), who observed that there was no growth of particles emitted from cooking oils and sweet Italian sausages.…”

Section: Resultssupporting

confidence: 92%

Physical properties and lung deposition of particles emitted from five major indoor sources

Ondráček

Ždı́mal

et al. 2016

Air Qual Atmos Health

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The physical properties of indoor particles were measured with an Scanning Mobility Particle Sizer (SMPS) system (14.6–850 nm), an Aerodynamic Particle Sizer (APS, 0.54–18 μm) and an Hygroscopic Tandem Differential Mobility Analyzer (H-TDMA) in an apartment located in an urban background site in Prague (Czech Republic) from 15 August to 8 September, 2014. The total particle maximum number concentration was 9.38 × 104, 1.46 × 105, 2.89 × 104, 2.25 × 105 and 1.57 × 106 particles cm−3 for particles released from vacuum cleaning, soap/W5 cleaning spray, smoking, incense burning and cooking (frying) activities, respectively. Particles emitted from cleaning activities showed unimodal number size distributions, with the majority of particles (>98.2 %) in the ultrafine size range (Dp <100 nm) and modes at a diameter of 19.8 nm for vacuum cleaning and 30.6 nm for soap/W5 cleaning. Smoking and incense burning predominantly generated particles in the accumulation mode with a count median diameter around 90–150 nm while cooking emissions showed a bimodal structure with a main mode at 47.8 nm. Particles from vacuum cleaning, incense burning, smoking and cooking emissions were found to be “nearly hydrophobic” with an average growth factor (Gf) around 1.01–1.10, while particles emitted from desk cleaning using organic compounds were found to be “less-hygroscopic” (Gf ∼1.12–1.16). Based on an adjusted MPPD model with a consideration of the hygroscopic properties of particles, the total lung deposition fractions of these particles by number when they penetrate into the human lung were 0.73 ± 0.02, 0.62 ± 0.03, 0.37 ± 0.03, 0.32 ± 0.03 and 0.49 ± 0.02 for vacuum cleaning, desk cleaning, smoking, incense burning and cooking, respectively.

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Section: Resultssupporting

confidence: 92%

Physical properties and lung deposition of particles emitted from five major indoor sources

Ondráček

Ždı́mal

et al. 2016

Air Qual Atmos Health

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“…The fuels used in that study were, however, not typical for the Amazon region. Dua and Hopke (1996) showed that the aerosol particles from flaming fires (burned in a non-optimized way) were hydrophobic (soot) while particles from the smoldering phase (non-combusted organic compounds) had a hygroscopic growth factor of around ∼2, measured at 99% RH (corresponding to a Gf ∼1.35 at 90% RH). To summarize, in this study both freshly emitted and aged aerosol particles originating from biomass burning smoke had quite low hygroscopic growth factors.…”

Section: Discussionmentioning

confidence: 99%

Size distribution and hygroscopic properties of aerosol particles from dry-season biomass burning in Amazonia

et al. 2006

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Abstract. Aerosol particle number size distributions and hygroscopic properties were measured at a pasture site in the southwestern Amazon region (Rondonia). The measurements were performed 11 September-14 November 2002 as part of LBA-SMOCC (Large scale Biosphere atmosphere experiment in Amazonia -SMOke aerosols, Clouds, rainfall and Climate), and cover the later part of the dry season (with heavy biomass burning), a transition period, and the onset of the wet period.Particle number size distributions were measured with a DMPS (Differential Mobility Particle Sizer, 3-850 nm) and an APS (Aerodynamic Particle Sizer), extending the distributions up to 3.3 µm in diameter. An H-TDMA (Hygroscopic Tandem Differential Mobility Analyzer) measured the hygroscopic diameter growth factors (Gf ) at 90% relative humidity (RH), for particles with dry diameters (d p ) between 20-440 nm, and at several occasions RH scans (30-90% RH) were performed for 165 nm particles. These data provide the most extensive characterization of Amazonian biomass burning aerosol, with respect to particle number size distributions and hygroscopic properties, presented until now. The evolution of the convective boundary layer over the course of the day causes a distinct diel variation in the aerosol physical properties, which was used to get information about the properties of the aerosol at higher altitudes.The number size distributions averaged over the three defined time periods showed three modes; a nucleation mode with geometrical median diameters (GMD) of ∼12 nm, an Aitken mode (GMD=61-92 nm) and an accumulation mode (GMD=128-190 nm). The two larger modes were shifted towards larger GMD with increasing influence from biomass burning.Correspondence to: J. Rissler (jenny.rissler@pixe.lth.se)The hygroscopic growth at 90% RH revealed a somewhat external mixture with two groups of particles; here denoted nearly hydrophobic (Gf ∼1.09 for 100 nm particles) and moderately hygroscopic (Gf ∼1.26). While the hygroscopic growth factors were surprisingly similar over the periods, the number fraction of particles belonging to each hygroscopic group varied more, with the dry period aerosol being more dominated by nearly hydrophobic particles. As a result the total particle water uptake rose going into the cleaner period. The fraction of moderately hygroscopic particles was consistently larger for particles in the accumulation mode compared to the Aitken mode for all periods. Scanning the H-TDMA over RH (30-90% RH) showed no deliquescence behavior. A parameterization of both Gf (RH) and Gf (d p ), is given.

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“…Weingartner et al (1997) showed that freshly produced diesel particles have very low hygroscopic growth factors close to 1.0 when exposed to a RH up to 99%. Dua and Hopke (1996) showed that particles from a residential wood stove with flames burning had growth factors close to 1.0 at RH~99%. However, during smouldering growth factors of around 2.0 were reported.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of aerosol particles formed during grate combustion of moist forest residue

Pagels

Strand

Rissler

et al. 2003

Journal of Aerosol Science

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Hygroscopic Growth of Assorted Indoor Aerosols

Cited by 42 publications

References 19 publications

Physical properties and lung deposition of particles emitted from five major indoor sources

Physical properties and lung deposition of particles emitted from five major indoor sources

Size distribution and hygroscopic properties of aerosol particles from dry-season biomass burning in Amazonia

Characteristics of aerosol particles formed during grate combustion of moist forest residue

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