Response to Comment on “Effect of Indirect Sample Preparation Procedures on the Apparent Concentration of Asbestos in Settled Dusts”

Lee, R. J.; Dagenhart, T. V.; Dunmyre, G. R.; Stewart, Ian; Orden, D.R. Van

doi:10.1021/es9510121

Cited by 3 publications

(3 citation statements)

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“…A few studies have been published on surface and passive sampling technology and have suggested that these methodologies are effective in quantifying episodic releases and surface contamination (loading and concentration) [25][26][27][28][29][30][31][32][33][34]. Some investigators have also suggested that settled dust can be related to airborne concentrations [35,36], while others have suggested that this association is not reliable [37,38]. Regardless, the regulatory acceptable methodology for final clearance of asbestos abatement projects is air sampling [39].…”

Section: Introductionmentioning

confidence: 99%

Surface and Passive Monitoring for Asbestos in an Industrial Facility

Lange¹,

Thomulka²,

Lee³

et al. 2002

Indoor Built Environ

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Surface and passive (deposition) samples were collected from an industrial facility that previously had partial asbestos abatement. Sampling, both surface and passive, was conducted in instrument control rooms and adjacent hallways. Complete abatement was performed in control rooms and partial abatement in hallways. The sampling time period for this study was 45 days. Sampling was conducted from both vertical and horizontal surfaces using surface particulate adhesive and passive samplers (deposition-dust fall samplers). A floor sample exhibited the highest surface loading. Overall, floors and countertops had similar surface loading with walls having the lowest. The highest wall surface loading did not exceed some of the lower values for floors and countertops. Deposition of asbestos structures was low and consisted primarily of structures smaller than 5 µm in length. Surface concentration in structures per square millimeters for surfaces ranged from the detection limit, which was less than 25, to approximately 363,400. Use of surface and passive sampling for evaluating fallout and surfacing loads of asbestos is discussed.

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Section: Introductionmentioning

confidence: 99%

Surface and Passive Monitoring for Asbestos in an Industrial Facility

Lange¹,

Thomulka²,

Lee³

et al. 2002

Indoor Built Environ

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Surface and Passive Monitoring for Asbestos in an Industrial Facility

Lange¹,

Thomulka

Lee

et al. 2002

Indoor and Built Environment

View full text Add to dashboard Cite

Surface and passive (deposition) samples were collected from an industrial facility that previously had partial asbestos abatement. Sampling, both surface and passive, was conducted in instrument control rooms and Surface concentration in structures per square millimeters for surfaces ranged from the detection limit, which was less than 25, to approximately 363,400. Use of surface and passive sampling for evaluating fallout and surfacing loads of asbestos is discussed.

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“…Recently, however, the effects of surfactants and of sonication duration on asbestos dusts have been explored. It has been shown ( − ) that increasing sonication times result in higher apparent asbestos concentrations, presum ably as a result of physical and chemical release of asbestos from matrices, from dissolution of bundles into individual fibrils, and from comminution of the fibers into more numerous, shorter and thinner fibrils.…”

Section: Introductionmentioning

confidence: 99%

Interlaboratory Evaluation of the Breakup of Asbestos-Containing Dust Particles by Ultrasonic Agitation

Lee¹,

Orden²,

Dunmyre³

1996

Environ. Sci. Technol.

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Measurement of asbestos in settled dust has been suggested as a surrogate for past and potential future airborne exposures. While conceptually appealing, identification and quantitation of those respirable particles that either were airborne or could become airborne through re-entrainment are complex and difficult tasks. Round robin testing of a draft ASTM method [The method has recently been balloted and passed by ASTM as Method D-5755.] for determining asbestos in dust was performed to assess the vari ability of the method and the impact of large, non-respirable asbestos-containing particles on the reported numerical concentration of respirable asbestos structures. Tests conducted using single, non-respirable particles of asbestos or asbestos-containing materials (ACM) indicate that these large particles can give apparent concentrations of asbestos in the dust on the order of millions of structures per square centimeter. Coefficients of variation (CV) ranged up to 2 for these tests, primarily the result of variable application of the indirect preparation procedure. A second series of tests was conducted using simulated building dusts. ACM dust was blown throughout a controlled chamber, and the resulting settled dust was sampled and distributed to participating laboratories. These results indicate that the interlaboratory CV is similar to that of the first tests, but can be reduced to 0.8 if restrictions are placed on the indirect sample preparation procedure. There was no statistically significant difference in the concentration of asbestos collected from three different surfaces, but this is the result of limited data and highly variable results. Overall, these tests indicate that the analysis of surface dusts using indirect sample preparation should be limited to qualitative evaluation as to the presence of asbestos in the surface dust.

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Response to Comment on “Effect of Indirect Sample Preparation Procedures on the Apparent Concentration of Asbestos in Settled Dusts”

Cited by 3 publications

References 1 publication

Surface and Passive Monitoring for Asbestos in an Industrial Facility

Surface and Passive Monitoring for Asbestos in an Industrial Facility

Surface and Passive Monitoring for Asbestos in an Industrial Facility

Interlaboratory Evaluation of the Breakup of Asbestos-Containing Dust Particles by Ultrasonic Agitation

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