Field evaluation of thermal and chemical desorption BTEX radial diffusive sampler radiello compared with active (pumped) samplers for ambient air measurements

The performance of two types of radiello diffusive samplers, filled with a thermally desorbable adsorbent (graphitised carbon Carbograph 4) and with a solvent desorbable adsorbent (activated charcoal), respectively, have been evaluated for the monitoring of BTEX in ambient air, by comparison with ac...

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Bibliographic Details
Published in:Journal of environmental monitoring 2009-02, Vol.11 (2), p.297-306
Main Authors: Cocheo, Claudio, Boaretto, Caterina, Pagani, Diego, Quaglio, Franco, Sacco, Paolo, Zaratin, Laura, Cottica, Danilo
Format: Article
Language:English
Subjects:
Adsorption
Air - analysis
Air Pollutants - analysis
Benzene - analysis
Environmental Monitoring - instrumentation
Environmental Monitoring - methods
Reproducibility of Results
Sensitivity and Specificity
Temperature
Time Factors
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Summary:The performance of two types of radiello diffusive samplers, filled with a thermally desorbable adsorbent (graphitised carbon Carbograph 4) and with a solvent desorbable adsorbent (activated charcoal), respectively, have been evaluated for the monitoring of BTEX in ambient air, by comparison with active (pumped) samplers. A two year survey was carried out in Padua, a medium-sized town, in a traffic site, close to a busy crossroad. The concentrations of BTEX were measured for 15 campaigns, during which four series of radial diffusive samplers were exposed for 2 day, 7 day, 10 day and 14 day time periods, respectively. Every series of chemical desorption samplers included three replicates; thermal desorption samplers included six replicates, three of them filled with freshly conditioned cartridges and three filled with regenerated cartridges. No significant difference in the levels measured either by new or by regenerated cartridges has been found. During three campaigns (summer 2004, winter and spring 2005) two active (pumped) samplers were added for each sampling period. The diffusive uptake rates have been calculated and modelled under various conditions of concentration, temperature and exposure time. The effects of the environmental factors on the performances of both solvent and thermally desorbable samplers have been evaluated. The repeatability of the whole measurement process (sampling and analysis) was calculated for every sampling duration. The comparison of concentration levels measured by diffusive and active sampling methods shows correlation coefficients R >or= 0.98 (p
ISSN:1464-0325
1464-0333
DOI:10.1039/b814629b