An evaluation of nebulized ammonium fluorescein as a laboratory aerosol

Stöber, Werner; Flachsbart, Hermann

doi:10.1016/0004-6981(73)90154-6

Cited by 26 publications

(11 citation statements)

References 10 publications

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“…For our experiments, performed at a relative humidity of 77 ± 5 %, we deduce a GF of 1.25 ± 0.05. Stöber and Flachsbart (1973) have measured a density of 1.58 g cm −3 for a dry fluorescein aerosol particle. Using Eq.…”

Section: Resultsmentioning

confidence: 99%

Experimental evidence of the rear capture of aerosol particles by raindrops

Lemaître

Quérel

Monier³

et al. 2017

Atmos. Chem. Phys.

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Abstract. This article presents new measurements of the efficiency with which aerosol particles of accumulation mode size are collected by a 1.25 mm sized raindrop. These laboratory measurements provide the link to reconcile the scavenging coefficients obtained from theoretical approaches with those from experimental studies. We provide here experimental proof of the rear capture mechanism in the flow around drops, which has a fundamental effect on submicroscopic particles. These experiments thus confirm the efficiencies theoretically simulated by Beard (1974). Finally, we propose a semi-analytical expression to take into account this essential mechanism to calculate the collection efficiency for drops within the rain size range.

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Section: Resultsmentioning

confidence: 99%

Experimental evidence of the rear capture of aerosol particles by raindrops

Lemaître

Quérel

Monier³

et al. 2017

Atmos. Chem. Phys.

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“…Fluorometric analysis is advantageous when the total mass of collected particles is less than 10 ng (Stöber and Flachsbart 1973). Aqueous suspensions of PSL aerosols (Fluoro-Max™ Green Aqueous Fluorescent Particles, Thermo Fisher Scientific Inc., Waltham, MA, USA) were aerosolized by introducing filtered compressed air at a flow rate of 5 L min -1 into a 1-jet Collision Nebulizer (BGI, Mesa Labs Inc., Butler, NJ, USA).…”

Section: Aerosol Sampling Of Laboratory Particlesmentioning

confidence: 99%

A Low-Cost Device for Bulk Sampling of Airborne Particulate Matter: Evaluation of an Ionic Charging Device

Afshar-Mohajer

Godfrey

Rule

et al. 2017

Aerosol Air Qual. Res.

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Bulk sampling of aerosols is often needed for the determination of physical properties, chemical composition and toxicity assessments of airborne particulate matter. Conventional aerosol samplers have several limitations for use as bulk aerosol collectors including cost, noise levels, power requirements associated with the use of a pump, limited flow rate, and a relatively long sampling time needed to collect sufficient mass to achieve gravimetric or other method limits of detection. In this study, a low-cost ionic charging device (ICD) was evaluated that addresses many of the drawbacks of conventional aerosol samplers. Different types of particles including incense fume, Arizona Road Dust (ARD) powders and Polystyrene Latex (PSL) spheres of different sizes were aerosolized then sampled using three ICDs and compared to conventional inhalable and PM 2.5 (particulate matter with aerodynamic diameter less than 100 µm and 2.5 µm, respectively) aerosol samplers in a controlled laboratory chamber at varying concentrations. The device was also evaluated in indoor environments. ICDs operate at almost 18.5 times higher flow rate than conventional personal samplers and provided up to 9 times greater total collected mass compared to the conventional samplers over the same time frame. Using a regression analysis, aerosol-specific linear equations with slopes (C PM2.5 /C ICD ) from 1.21 to 7.10 and R 2 from 0.74 to 0.99 for estimating the inhalable and PM 2.5 mass concentrations using the ICD were derived. This study suggests that the ICD provides a less accurate estimate of size-selective PM mass concentrations than conventional personal aerosol samplers; however, it collects coarse particles efficiently and increases total sampled mass per time at a lower cost and without noise associated with traditional sampling methods. Therefore, the ICD can be used as a bulk aerosol collector for composition analyses and in-vitro toxicology tests of coarse PM.

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“…These methods were not very efficient in separating fibers from particles of similar diameter because the aerodynamic diameter of an elongated object depends weakly on its length. An empirical expression obtained from centrifuge experiments showed that the fiber aerodynamic diameter is proportional to the sixth root of the ratio of the length to the diameter (Stober et al, 1970;Stober, 1972). A sedimentation method described by Timbrel1 (1972) succeeded, only with very low flow rates (100 cm3/min), in classifying fibers with aerodynamic diameter larger than 1.5 pm.…”

Section: Introductionmentioning

confidence: 99%