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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2010

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Fractional factorial experiments using a test atmosphere to assess the accuracy and precision of a new passive sampler for the determination of formaldehyde in the atmosphere.

Anno di pubblicazione: 2010

Formato: Elettronico Cartaceo

Autori: Mabilia, R. (a), Scipioni, C. (a), Vegliò, F. (b), Tomasi Scianò, M.C. (a)

Affiliazioni autori: a) CNR Institute for Atmospheric Pollution, CP 10, Monterotondo Scalo, 00015 Rome, Italy; b) Department of Chemistry, Chemical Engineering and Materials, University of L'Aquila, Monteluco di Roio, 67040-L'Aquila, Italy;

Autori CNR:


Lingua: inglese

Abstract: A new analytical method was developed for the determination of formaldehyde in ambient air based on the use of a modified configuration of the Analyst passive sampler. It consists of a polyethylene cylinder filled with appropriate reactive adsorbent and a special anti-turbulence net which works as an ozone scrubber. The performance of a diffusive sampler depends critically on the selection and use of a suitable adsorbent and on environmental factors, such as temperature, humidity and the interference of oxidant species. In this study two adsorbent types were investigated: 2,4-dinitrophenylhydrazine (2,4-DNPH) coated silica gel and Florisil particles. Interference of ozone was removed by using a silver net upstream as an anti-turbulence device. The performance of this net was then compared with that of stainless steel. Furthermore, the aim of the work was the optimization of the adsorbent type and the study of the interference of ozone with particular attention placed on the effect of relative humidity and temperature. A dynamic system for generating a known concentration of the test gas (formaldehyde) in an appropriate exposure chamber was used to evaluate the performance of the passive sampler and to allow the calibration of the methodology. Inter-comparisons with a reference method, active sampling using 2,4-DNPH-silica gel coated cartridges, were also carried out. Results were in accordance with each other. Tests were planned using a statistical method based on Design of Experiment methodology. The operating conditions were chosen in order to obtain the best configuration of the passive device by evaluating the statistical significance of the different factors and their interactions by analysis of variance. Results showed that the best configuration was achieved using 2,4-DNPH Florisil coated particles as an adsorbent and a silver anti-turbulence net as an ozone scrubber. With the aim of achieving further results in realistic conditions, some field experiments were also carried out.

Lingua abstract: inglese

Pagine da: 3942

Pagine a: 3951

Pagine totali: 10


Atmospheric environment Pergamon.
Paese di pubblicazione: Regno Unito
Lingua: inglese
ISSN: 1352-2310

Numero volume: 44

Numero fascicolo: 32

DOI: 10.1016/j.atmosenv.2010.05.

Indicizzato da: ISI Web of Science (WOS) [000281928900010]

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