Measurement of C24H14 Polycyclic Aromatic Hydrocarbons Associated with a Size-Segregated Urban Aerosol
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- 作者：Jonathan O. Allen ; John L. Durant ; Nameeta M. Dookeran ; Koli Taghizadeh ; Elaine F. Plummer ; Arthur L. Lafleur ; Adel F. Sarofim ; and Kenneth A. Smith
- 刊名：Environmental Science & Technology
- 出版年：1998
- 出版时间：July 1, 1998
- 年：1998
- 卷：32
- 期：13
- 页码：1928 - 1932
- 全文大小：67K
- 年卷期：v.32,no.13(July 1, 1998)
- ISSN：1520-5851
文摘
Six-ring C24H14 (MW 302) polycyclic aromatichydrocarbons(PAH), some of which are potent mutagens, are present inurban aerosols. Size-segregated atmospheric aerosolsamples from Boston, MA, were analyzed forC24H14 PAHby gas chromatography/mass spectrometry. Eleven peakswere found with mass to charge ratios of 302; of these,eightwere identified using authentic standards. Five ofthepeaks were quantified. For each of these five, thedistributionswith respect to particle size were bimodal with themajorityof the mass associated with accumulation mode particles(0.3-1.0 
m) and a smaller fraction of the massassociatedwith ultrafine mode particles (0.09-0.14 m). Thesedistributions are similar to those observed for PAH of molecularweight 252-278 in the same sample but different fromthose of benzo[ghi]perylene (MW 276) andcoronene (MW300), which were associated to a greater degree withultrafine particles. The data suggest thatC24H14 PAH repartition to larger particles by vaporization and sorptionmore rapidly than do benzo[ghi]perylene andcoronene. Thetotal concentration of C24H14 PAH (1.5ng/m3) wascomparable to that of benzo[a]pyrene in the samesample.Because of their mutagenicities, C24H14PAH may makea contribution to the genotoxicity of urban aerosols comparable to that ofbenzo[a]pyrene.
m) and a smaller fraction of the massassociatedwith ultrafine mode particles (0.09-0.14 m). Thesedistributions are similar to those observed for PAH of molecularweight 252-278 in the same sample but different fromthose of benzo[ghi]perylene (MW 276) andcoronene (MW300), which were associated to a greater degree withultrafine particles. The data suggest thatC24H14 PAH repartition to larger particles by vaporization and sorptionmore rapidly than do benzo[ghi]perylene andcoronene. Thetotal concentration of C24H14 PAH (1.5ng/m3) wascomparable to that of benzo[a]pyrene in the samesample.Because of their mutagenicities, C24H14PAH may makea contribution to the genotoxicity of urban aerosols comparable to that ofbenzo[a]pyrene.