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    Validation of Low Resistance Filters for Gas/Vapour Sampling.

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    PhD Thesis_Ayman Arfaj.pdf (3.030Mb)
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    Publication date
    2010-03-10T16:51:42Z
    Author
    Alarfaj, Ayman M.A.
    Supervisor
    Dennis, John
    Heron, Carl P.
    El-Khashab, M.I.
    Keyword
    Occupational hygiene
    Activated carbon
    Low resistance filter
    Air sampling
    Desorption efficiency
    Organic vapours
    Organic gases
    Rights
    Creative Commons License
    The University of Bradford theses are licenced under a Creative Commons Licence.
    Institution
    University of Bradford
    Department
    Division of Archaeological, Geographical and Environmental Sciences School of Life Sciences
    Awarded
    2009
    
    Metadata
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    Abstract
    Traditional occupational hygiene assessment of occupational exposures to organic gases and vapours rely on low flow (<200 ml/min) NIOSH sorbent tubes. This work investigates 3M charcoal filter media (JK50 and JK40, 3M, Inc.) for collection and analysis of organic vapours across 0.1 ¿ 5 l/min. To enable this work, a custom exposure facility was constructed and validated within which organic analyte gas/vapour concentrations could be introduced at known concentrations while controlling environmental variables such as temperature and humidity and other variables. This facility enabled experiments designed to investigate collection and desorption efficiencies across a range of sample flow rates, temperature and humidity conditions for both NIOSH sorbent tubes (e.g. SKC tube) and 3M charcoal filter media. As a result of the investigations described in this thesis, the following conclusions are drawn. Performance of the 3M charcoal filter media for collection and desorption efficiencies for loading, storage time, humidity and breakthrough at low flow rates (<0.5 l/min) were found comparable to the SKC sorbent tube. It is concluded that 3M charcoal media (JK50 and JK40) are suitable for sampling and analyses of hydrocarbons at flow rates <0.5 l/min. The collection efficiencies of the 3M charcoal filter media were investigated at high flow rates (>0.5l/min) for the same parameters, i.e., loading, temperature and humidity. It is concluded that 3M charcoal filter media can be used with confidence in sampling and analysis of airborne hydrocarbons up to 5 l/min. The Wheeler-Jonas model was found to satisfactorily predict the adsorption kinetics of the 3M charcoal filter media at different loading values of hydrocarbons. It was therefore concluded that the model can be applied to determine the suitable amount of 3M charcoal filter media prior to sampling for a given loading.
    URI
    http://hdl.handle.net/10454/4257
    Type
    Thesis
    Qualification name
    PhD
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