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Comment on comparison of powder dustiness methods.

Authors
Evans-DE; Turkevich-LA; Roettgers-CT; Deye-GJ
Source
Ann Occup Hyg 2014 May; 58(4):524-528
NIOSHTIC No.
20043811
Abstract
We have read with interest the recent work by the University of Wuppertal group (Bach et al., 2013) on dustiness determination using the University of North Carolina (UNC) Dustiness Testing Device (Boundy et al., 2006). We have referred to the UNC device as the "Venturi" device (Evans et al., 2013), as that describes the underlying dispersal mechanism; we continue with this terminology. The Wuppertal paper is presented in two parts. In Part 1, the dustiness of nine industrial powders was measured with the Venturi device, and results compared with their earlier measurements (Bach and Schmidt, 2008) using macroscopic techniques: EN 1505 standardized continuous drop (CEN 2006, 2013) and the commercial Heubach rotating drum and commercial Palas single drop. In Part 2, dustiness values for 11 pharmaceutical powders were determined solely with the Venturi device. We would like to comment on these Wuppertal results, especially in light of our previous and extensive use of the Venturi device for fine and nanoscale powders (Evans et al., 2013). Unfortunately, insufficient detail is provided on the provenance of the Wuppertal powders (Bach and Schmidt, 2008; Bach et al., 2013), to allow an interlaboratory comparison with identical materials. (By contrast, our measurements (Evans et al., 2013) for Holland lactose of Dtot = 5.2 (0.4)% and Dresp = 0.9 (0.1)% are fully consistent with those of the UNC group (Boundy et al., 2006), with Dtot = 5.1 (0.9)% and Dresp = 1.3 (0.5)% for the same material.) In the technique comparison, Part 1, of the Wuppertal study, only three Venturi measurements were made for each powder, and no ranges or statistics were reported. In the pharmaceutical, Part 2, of their study, five Venturi measurements were made for each powder, and standard deviations were reported, permitting some analysis of possible error. Finally, we observed an empirical correlation between respirable and total dustiness, as measured with the Venturi device, to hold for a wide range of powders (Evans et al., 2013). It is informative to test that empirical correlation with these additional Wuppertal results.
Keywords
Dust-measurement; Measurement-equipment; Analytical-instruments; Laboratory-equipment; Laboratory-techniques; Dusts; Pharmaceuticals; Equipment-reliability; Performance-capability
Contact
Douglas E. Evans, Chemical Exposure and Monitoring Branch, Division of Applied Research & Technology, National Institute for Occupational Safety & Health, Centers for Disease Control & Prevention, Cincinnati, OH 45226, USA
CODEN
AOHYA3
Publication Date
20140501
Document Type
Other
Email Address
dje3@cdc.gov
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
M022014
Issue of Publication
4
ISSN
0003-4878
NIOSH Division
DART
Priority Area
Manufacturing
Source Name
Annals of Occupational Hygiene
State
OH
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