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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
The use of multi-channel silicone rubber traps as denuders for polycyclic aromatic hydrocarbons
Analytica Chimica Acta, Volume 730, Year 2012
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Description
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 178mm long, 6mm 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 ~0.5Lmin -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>50nm, 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 20nm and 100% for particles larger than 200nm. 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 GC-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. © 2011 Elsevier B.V.
Authors & Co-Authors
Forbes, Patricia B.C.
South Africa, Pretoria
University of Pretoria
Karg, Erwin W.
Germany, Oberschleissheim
Helmholtz Center Munich German Research Center for Environmental Health
Zimmermann, Ralf
Germany, Oberschleissheim
Helmholtz Center Munich German Research Center for Environmental Health
Germany, Rostock
Universität Rostock
Rohwer, Egmont Richard
South Africa, Pretoria
University of Pretoria
Statistics
Citations: 33
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.aca.2011.11.013
e-ISSN:
18734324
Research Areas
Environmental
Study Design
Cohort Study