Technical Note: Performance of a Personal Electrostatic Precipitator Particle Sampler

Cardello, N.; Volckens, John; Tolocka, Michael P.; Wiener, Russell W.; Buckley, Timothy J.

doi:10.1080/027868202753504029

Cited by 34 publications

(24 citation statements)

References 18 publications

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“…For example, in the efficiency data of Figure 8, we see a region of minimum collection between 100 and 200 nm, similar to that previously reported (Cardello et al 2002). We also see an improvement in efficiency between about 30 and 100 nm as reported previously (Cardello et al 2002;Fierz et al 2007). In addition to these similarities there are also differences in the data.…”

Section: Evaluating Collection Efficiencysupporting

confidence: 90%

“…In addition, with the advent of nanotechnologies, processes that produce nanoparticles or that have nanoscale waste materials are potentially exposing workers to a new generation of airborne hazards. Since nanomaterials have the potential for enhanced bioavailability and thus detrimental health effects (Oberdoerster 2001;Cardello et al 2002;Ibald-Mulli et al 2002;Kandlikar et al 2007), the authors and others have begun to focus research on the characterization of nanoaerosols in workplace environments. Much of that work is focused on measuring the number, size, and available surface area of aerosols in the workplace (in addition to their mass concentration, which is more commonly measured).…”

Section: Introductionmentioning

confidence: 99%

“…Other researchers have reported successful applications of ESP samplers for particle collection (Morrow and Mercer 1964;Leith et al 1996;Cardello et al 2002;Ku and Maynard 2005;Fierz et al 2007) but a drawback of existing ESP particle samplers is that most are bench top units and none are truly handheld, i.e., amenable for use in collecting workplace samples.…”

Section: Introductionmentioning

confidence: 99%

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A Handheld Electrostatic Precipitator for Sampling Airborne Particles and Nanoparticles

Miller¹,

Frey²,

King³

et al. 2010

Aerosol Science and Technology

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Researchers at NIOSH are developing methods for characterizing ultrafine aerosols in workplaces. One method includes the detailed analysis of collected particles using electron microscopy (EM). In order to collect samples for EM at remote workplaces including mining and manufacturing facilities, researchers have developed a handheld electrostatic precipitator (ESP) particle sampler capable of collecting airborne particles including nanoscale materials, for subsequent EM analysis. The handheld ESP has been tested in the laboratory and is currently undergoing beta testing in the field. Gross collection efficiencies were measured with a CPC and net efficiencies by EM analysis of collected samples. Using laboratory-generated NaCl aerosols in the 30-400 nm size range at a flow rate of 55 cc/min and ESP operating voltages between 5.6-6.8 kV, both gross and net efficiencies were measured and showed a similar correlation with voltage, with maximum efficiency of approximately 86% at 6.4 kV. EM images from samples were also used to estimate particle size distributions of the original aerosols and the size-dependent deposition was evaluated for upstream versus downstream locations on the sample media. Results suggest that the number concentration and particle size distribution of sampled aerosols may potentially be estimated from a single ESP sample, but that the accuracy and repeatability of such quantification need to be investigated and refined. NIOSH is planning to license the ESP sampler for commercial manufacturing.

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Section: Evaluating Collection Efficiencysupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Handheld Electrostatic Precipitator for Sampling Airborne Particles and Nanoparticles

Miller¹,

Frey²,

King³

et al. 2010

Aerosol Science and Technology

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“…Tisch PTFE filters were selected because they exhibit a relatively low pressure drop and are comprised of hydrophobic polytetrafluoroethylene, which is less susceptible to organic vapor 235 adsorption artifacts than other fibrous filter materials (Kirchstetter et al, 2001;Mader and Pankow, 2001 sampling results suggested a non-ideal collection efficiency for accumulation-mode aerosol using the Tisch PTFE filters. Subsequent laboratory tests, using a previously described protocol (Cardello et al, 2002), confirmed the relatively low collection efficiency of these filters (results shown in Fig. S2).…”

Section: Prescribed Firementioning

confidence: 65%

A low-cost PM<sub>2.5</sub> monitor for wildland fire smoke

Kelleher

Quinn

Miller‐Lionberg

et al. 2017

Preprint

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Abstract.Wildfires and prescribed fires produce emissions that degrade visibility and are harmful to human health. Smoke emissions and exposure monitoring is critical for public and environmental health protection; however, ground-level measurements of smoke from wildfires and prescribed fires has proven difficult, as existing (validated) monitoring technologies are expensive, 10 cumbersome, and generally require line power. Few ground-based measurements are made during fire events, which limits our ability to assess the environmental and human health impacts of wildland fire smoke. Thirteen OAS were deployed to monitor smoke concentrations downwind from a large prescribed fire. Aerosol mass concentrations were interpolated across the monitoring network to depict smoke concentration gradients in the vicinity of the fire. Strong concentration gradients were observed (spatially and temporally) and likely present due to a combination of 25 changing fire location and intensity, topographical features (e.g. mountain ridges), and diurnal weather patterns. Gravimetric filter measurements made by the OAS (when corrected for filter collection efficiency) showed relatively good agreement with measurements from an EPA federal equivalent monitor. However, the real-time optical sensor (Sharp GP2Y1023AU0F) within the OAS suffered from temperature dependence, drift, and imprecision.Atmos. Meas. Tech. Discuss., https://doi

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“…However, ESP technology also has drawbacks. First, collection efficiency varies with particle size (Cardello et al 2002;Miller et al 2010) and tends to drop off precipitously below 20 nm (Cardello et al 2002). Second, the corona discharge creates reactive ions such as O + 2 and H 3 O + (Dzidic et al 1976) that charge the aerosol, but also creates oxidizing agents such as O 3 and NO x (Nashimoto 1988) that can alter particles' surface chemistry and cause a chemical artifact on the sample (Kaupp and Umlauf 1992;Volckens and Leith 2002a,b).…”

Section: Introductionmentioning

confidence: 99%

Development of a Transfer Function for a Personal, Thermophoretic Nanoparticle Sampler

Leith¹,

Miller-Lionberg²,

Casuccio³

et al. 2013

Aerosol Science and Technology

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Effective assessment of nanoparticle exposures requires accurate characterization of the aerosol. Of increasing concern is personal exposure to engineered nanoparticles that are specifically designed for use in the nanotechnology sector. This manuscript describes the operation and use of a personal sampler that utilizes thermophoretic force to collect nanoparticles onto a standard TEM (transmission electron microscope) grid. After collection, nanoparticles on the TEM grid are analyzed with an electron microscope, and the resultant data used to determine the characteristics of the nanoparticle aerosol sampled. Laboratory experiments were conducted to determine the inlet losses and collection efficiency of the thermophoretic sampler for particles between 20 and 600 nm in diameter. These results are used together with theory for thermophoretic velocity to form a transfer function that relates the properties of the collected particles to the properties of the sampled aerosol. The transfer function utilizes a normalization factor, F(d), which is larger than unity for very small particles but approaches unity for particles larger than about 70 nm.

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Technical Note: Performance of a Personal Electrostatic Precipitator Particle Sampler

Cited by 34 publications

References 18 publications

A Handheld Electrostatic Precipitator for Sampling Airborne Particles and Nanoparticles

A Handheld Electrostatic Precipitator for Sampling Airborne Particles and Nanoparticles

A low-cost PM<sub>2.5</sub> monitor for wildland fire smoke

Development of a Transfer Function for a Personal, Thermophoretic Nanoparticle Sampler

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Technical Note: Performance of a Personal Electrostatic Precipitator Particle Sampler

Cited by 34 publications

References 18 publications

A Handheld Electrostatic Precipitator for Sampling Airborne Particles and Nanoparticles

A Handheld Electrostatic Precipitator for Sampling Airborne Particles and Nanoparticles

A low-cost PM&lt;sub&gt;2.5&lt;/sub&gt; monitor for wildland fire smoke

Development of a Transfer Function for a Personal, Thermophoretic Nanoparticle Sampler

Contact Info

Product

Resources

About

A low-cost PM<sub>2.5</sub> monitor for wildland fire smoke