The use of multi-channel silicone rubber traps as denuders for polycyclic aromatic hydrocarbons

Show simple item record Forbes, Patricia B.C. Karg, Erwin W. Zimmerman, Ralf Rohwer, Egmont Richard 2012-07-11T06:11:34Z 2012-07-11T06:11:34Z 2012-06
dc.description.abstract Atmospheric polycyclic aromatic hydrocarbons are ubiquitous environmental pollutants, which may be present both in the gaseous phase and adsorbed onto the surface of particles. Denuders are sampling devices which have been effectively employed in such partitioning applications. Here we describe and characterise a novel miniature denuder consisting of two multi-channel silicone rubber traps (each 178 mm long, 6 mm o.d. containing 22 silicone tubes), separated by a quartz fibre filter for particle phase collection. The denuder only requires a small portable personal sampling pump to provide sampling flow rates of ~0.5 L min-1. Theoretical considerations indicated that the air flow through the denuder was expected to be laminar, and the linear velocity arising from longitudinal diffusion was found to be negligible. The calculated particle transmission efficiency through the denuder was found to be essentially 100 % for particles > 50 nm, whilst the experimental overall efficiency, as determined by CPC and SMPS measurements, was 92 ± 4 %. The size resolved transmission efficiency was < 60 % for particles below 20 nm and 100 % for particles larger than 200 nm. Losses could have been due to diffusion and electrostatic effects. Semi-volatile gaseous analytes are pre-concentrated in the silicone of the trap and may be thermally desorbed using a commercially available desorber, allowing for total transfer and detection of the collected analytes by GC36 MS. This enhances detection limits and allows for lower sampling flow rates and shorter sampling times, which are advantageous for studies requiring high temporal resolution. en
dc.description.librarian nf2012 en
dc.description.sponsorship The CSIR, NLC and NRF. en_US
dc.description.uri en_US
dc.identifier.citation Patricia B.C. Forbes, Erwin W. Karg, Ralf Zimmermann & Egmont R. Rohwer, The use of multi-channel silicone rubber traps as denuders for polycyclic aromatic hydrocarbons', Analytica Chimica Acta, vol. 730, pp. 71-79 (2012), doi:10.1016/j.aca.2011.11.013. en
dc.identifier.issn 0003-2670 (print)
dc.identifier.issn 1873-4324 (online)
dc.identifier.other 10.1016/j.aca.2011.11.013
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights © 2011 Elsevier B.V. All rights reserved. en_US
dc.subject Denuders en
dc.subject Particulate contamination en
dc.subject Silicone rubber traps en
dc.subject Ubiquitous environmental pollutants en
dc.subject.lcsh Polycyclic aromatic hydrocarbons en
dc.subject.lcsh Aerosols en
dc.subject.lcsh Air sampling apparatus en
dc.title The use of multi-channel silicone rubber traps as denuders for polycyclic aromatic hydrocarbons en
dc.type Postprint Article en

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