Aerosol filtration by means of Nuclepore filters: aerosol sampling and measurement

Spurný, K.R.; Lodge, James P.; Frank, Evelyn R.; Sheesley, D.C.

doi:10.1021/es60028a005

Cited by 61 publications

(25 citation statements)

References 1 publication

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“…Thus, it was understandable that filters were not very effective to remove ROS in this phase. However, depending on the pore size of the polycarbonate filters used in their study, there could be substantial penetration of the smoke particles through the filter pores (Spurny et al 1969a(Spurny et al , 1969b resulting in an underestimation of the particle-bound ROS. In the present study, the particulate phase was the major source of ROS and it was reasonable that filters could eliminate particle-bound ROS and PM mass.…”

Section: Effect Of Cigarette Filtersmentioning

confidence: 98%

Concentration of Reactive Oxygen Species (ROS) in Mainstream and Sidestream Cigarette Smoke

Zhao

Hopke

2012

Aerosol Science and Technology

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Reactive oxygen species (ROS) have been related to adverse health effects in recent years. Previous studies have reported ROS concentrations in mainstream smoke, but the reports have shown considerable variability and conclusions. There have been no prior measurements on sidestream smoke. In this study, the amounts of gas-phase and particle-bound ROS in tobacco smoke were determined using 2 ,7 -dichlorodihydrofluorescin diacetate (DCFH-DA) as the fluorescent probe with hydrogen peroxide as the standard. Both research and commercially available cigarettes were tested using mainstream and sidestream smoke generated by a Single Cigarette Smoking Machine. For mainstream smoke from regular and light cigarettes, the total quantities of ROS were 120-150 nmol and 90-110 nmol, respectively. For sidestream smoke, the values were 60-90 nmol and 30-70 nmol for regular and light cigarettes, respectively. The effects of the cigarette filter on the emissions were to reduce the particle mass and particle-phase ROS in the mainstream smoke.

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Section: Effect Of Cigarette Filtersmentioning

confidence: 98%

Concentration of Reactive Oxygen Species (ROS) in Mainstream and Sidestream Cigarette Smoke

Zhao

Hopke

2012

Aerosol Science and Technology

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“…Spurny et al (1969b and1974) studied the time development of pressure drop in Nuclepore lters in an attempt to understand clogging mechanisms. Three different clogging stages were identi ed.…”

Section: Nuclepore Filtersmentioning

confidence: 99%

“…For each face velocity and pore size, the values of constants A 0 and x1, along with their corresponding p -values are presented. The results of Table 3 clearly show that x1 (i.e., the slope of the regression line) for each con guration is statistically not different from zero, thereby indicating that d (D P )/ cm / t is independent of particle size for particles in the size range of 0.2-1.0 m m. The value of A 0 represents the average increase in pressure drop per unit time and mass concentration for each con guration for particles in the size rages 0.2-1.0 m m. The observed increase in d(D P )/ cm / t for particles smaller than 0.2 m m is probably due to additional particle deposition by diffusion inside the pores, a mechanism that is expected to be more pronounced with decreasing particle size (Spurny et al 1969b;Manton 1978).…”

Section: Effect Of Particle Sizementioning

confidence: 99%

Experimental Investigation of Pressure Drop with Particle Loading in Nuclepore Filters

Sioutas¹

1999

Aerosol Science and Technology

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ABSTRACT. This paper presents an experimental investigation of the increase in pressure drop with particle loading in Nuclepore lters. The average increase in pressure drop per unit time and particle mass concentration was measured as a function of particle size, density, and hygroscopicity. Two different Nuclepore lter pore diameters were tested (2 and 5 m m, respectively) at lter face velocities ranging from 4 to 52 cm/s.Our results showed that the increase in the pressure drop with particle loading inversely proportional to the square root of particle speci c gravity and depends weakly on particle diameter (to the power of -0.2). Furthermore, the increase in the pressure drop with particle loading is proportional to the lter face velocity and inversely proportional to the cube of the pore diameter. Particle interception and impaction on the pore edges are the main deposition mechanisms that are responsible for raising the pressure drop over time across the lter, especially for particles having Stokes numbers below 5. Particle deposition due to diffusion inside the pores is important for particles smaller than 0.2 m m. These observations agree well with previously published studies on particle deposition on the pore edges in Nuclepore lters. Our tests also showed a dramatic decrease in the pressure drop with loading for hygroscopic particles as the relative humidity increases from 10% to 50%. The pressure drop with loading decreases almost inversely proportional to the relative humidity for ammonium sulfate particles.

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“…The practice and theory of track-etched filters for airborne particle sampling and microscopic collection has been reported [48,151 ], interesting applications being the sampling of radioactive aerosols [49,1521 and nuclei sampling as low as 103nm diameter used to predict an aerosol's residence time [153].…”

Section: Production Of Fine Filtersmentioning

confidence: 99%

Solid state nuclear track detectors

Hepburn

Windle

1980

J Mater Sci

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The materials science aspects of the use of both polymeric and inorganic solids as detectors for energetic particles are reviewed. The various models proposed to explain the formation of an etchable track by a penetrating particle are discussed, as is the nature and the geometric consequences of the etching process itself. An account is given of the wide-ranging applications of solid state detectors in science and technology.

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Aerosol filtration by means of Nuclepore filters: aerosol sampling and measurement

Cited by 61 publications

References 1 publication

Concentration of Reactive Oxygen Species (ROS) in Mainstream and Sidestream Cigarette Smoke

Concentration of Reactive Oxygen Species (ROS) in Mainstream and Sidestream Cigarette Smoke

Experimental Investigation of Pressure Drop with Particle Loading in Nuclepore Filters

Solid state nuclear track detectors

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