Measuring Sub-micron Size Fractionated Particulate Matter on Aluminum Impactor Disks

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Sub-micron sized airborne particulate matter is not collected well on regular quartz or glass fiber filter papers. We used a micro-orifice uniform deposit impactor (MOUDI) to size fractionate particulate matter (PM) into six size fractions and deposit it on specially designed high purity thin aluminum disks. The MOUDI separated PM into fractions 56-100 nm, 100-180 nm, 180-320 nm, 320-560 nm, 560-1000 nm, and 1000-1800 nm. Since MOUDI have low flow rates, it takes several days to collect sufficient carbon on 47 mm foil disks. The small carbon mass (20-200 microgram C) and large aluminum substrate ({approx}25 mg Al) presents several ... continued below

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Buchholz, B A; Zermeno, P; Hwang, H & Young, T M July 28, 2009.

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Sub-micron sized airborne particulate matter is not collected well on regular quartz or glass fiber filter papers. We used a micro-orifice uniform deposit impactor (MOUDI) to size fractionate particulate matter (PM) into six size fractions and deposit it on specially designed high purity thin aluminum disks. The MOUDI separated PM into fractions 56-100 nm, 100-180 nm, 180-320 nm, 320-560 nm, 560-1000 nm, and 1000-1800 nm. Since MOUDI have low flow rates, it takes several days to collect sufficient carbon on 47 mm foil disks. The small carbon mass (20-200 microgram C) and large aluminum substrate ({approx}25 mg Al) presents several challenges to production of graphite targets for accelerator mass spectrometry (AMS) analysis. The Al foil consumes large amounts of oxygen as it is heated and tends to melt into quartz combustion tubes, causing gas leaks. We describe sample processing techniques to reliably produce graphitic targets for {sup 14}C-AMS analysis of PM deposited on Al impact foils.

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PDF-file: 17 pages; size: 1 Mbytes

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  • Journal Name: Radiocarbon, vol. 52, no. 2, July 30, 2010, pp. 278-285; Journal Volume: 52; Journal Issue: 2

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  • Report No.: LLNL-JRNL-415146
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 989336
  • Archival Resource Key: ark:/67531/metadc1012630

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Office of Scientific & Technical Information Technical Reports

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  • July 28, 2009

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 27, 2017, 5:37 p.m.

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Buchholz, B A; Zermeno, P; Hwang, H & Young, T M. Measuring Sub-micron Size Fractionated Particulate Matter on Aluminum Impactor Disks, article, July 28, 2009; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc1012630/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.