Continuous Measurement of Semivolatile Fine Particulate Mass in Provo, Utah
Titel:
Continuous Measurement of Semivolatile Fine Particulate Mass in Provo, Utah
Auteur:
Obeidi, Fida Eatough, Delbert J.
Verschenen in:
Aerosol science and technology
Paginering:
Jaargang 36 (2002) nr. 2 pagina's 191-203
Jaar:
2002-02
Inhoud:
Ambient particles contain substantial quantities of material that can be lost from the particles during sample collection on a filter, including ammonium nitrate and semivolatile organic compounds. The real-time ambient mass sampler (RAMS) described in this paper has been developed for the accurate continuous monitoring of fine particulate material. The previously published version of the RAMS had significant problems with a variable blank correction. A series of experiments conducted in Provo, UT, during December, 1998, indicated that nitrogen oxides and water were the major contributors to a high morning blank. This blank was minimized by heating the Brigham Young University Organic Sampling System (BOSS) charcoal diffusion denuder and adding multichannel annular denuders coated with triethanolamine (TEA) to remove NO 2 . This new configuration of the RAMS was used to collect samples on 5 consecutive days in Provo, UT. These results were compared to measurements made in both 6 h and 24 h integrated samples using the Particle Concentrator-BOSS (PC-BOSS). An average of 1% of the Provo fine particulate material was present as ammonium nitrate and 15% as semivolatile organic material, which were lost from a filter during sampling for samples collected over 24 h and 6 h average periods. These species were correctly determined by the RAMS.
Tijdschrift beschrijving