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Sökning: onr:cmx2c9z195rgl65f > Choosing the number...

Choosing the number of images and image position when analysing the UNC Passive Aerosol Sampler for occupational exposure assessment [Elektronisk resurs]

Shirdel, Mariam (författare)
Sommar, Johan N. (författare)
Andersson, Britt M., 1962- (författare)
Bergdahl, Ingvar A. (författare)
Wingfors, H (författare)
Liljelind, Ingrid E. (författare)
Umeå universitet Medicinska fakulteten (utgivare)
Umeå universitet Teknisk-naturvetenskapliga fakulteten (utgivare)
Publicerad: Taylor & Francis, 2018
Engelska.
Ingår i: Journal of Occupational and Environmental Hygiene. - 1545-9624. ; 15:11, 767-772
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  • E-artikel/E-kapitel
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  • The University of North Carolina passive aerosol sampler (UNC sampler) could be an alternative when measuring occupational dust exposure, but the time required for microscopic imaging of the sampler needs to be reduced to make it more attractive. The aims of this study were to 1) characterise the effect on precision when reducing imaging, in order to shorten analysis time and 2) assess if the position of the images makes a difference. Eighty-eight samplers were deployed in different locations of an open pit mine. Sixty images were captured for each UNC sampler, covering 51% of its collection surface, using scanning electron microscopy. Bootstrapped samples were generated with different image combinations, to assess the within-sampler coefficient of variation (CV ws ) for different numbers of images. In addition, the particle concentration relative to the distance from the centre of the sampler was studied. Reducing the number of images collected from the UNC sampler led to up to 8.3% CV ws for ten images when calculating respirable fraction. As the overall CV has previously been assessed to 36%, the additional contribution becomes minimal, increasing the overall CV to 37%. The mean concentrations of the images were modestly related to distance from the centre of the sampler. The CV ws changed from 8.26% to 8.13% for ten images when applying rules for the image collection based on distance. Thus, the benefit of these rules on the precision is small and the images can therefore be chosen at random. In conclusion, reducing the number of images analysed from 60 to 10, corresponding to a reduction of the imaged sampling area from 51% to 8.5%, results in a negligible loss in precision for respirable fraction dust measurements in occupational environments. 

Ämnesord

Medical and Health Sciences  (hsv)
Health Sciences  (hsv)
Public Health, Global Health, Social Medicine and Epidemiology  (hsv)
Medicin och hälsovetenskap  (hsv)
Hälsovetenskaper  (hsv)
Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi  (hsv)
Natural Sciences  (hsv)
Earth and Related Environmental Sciences  (hsv)
Environmental Sciences  (hsv)
Naturvetenskap  (hsv)
Geovetenskap och miljövetenskap  (hsv)
Miljövetenskap  (hsv)

Genre

government publication  (marcgt)

Indexterm och SAB-rubrik

Dust particles
PM10
PM2.5
occupational hygienist
passive sampling
respirable fraction
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