SupplementofAtmos.Chem.Phys.,重点.PDFVIP

Supplement of Atmos. Chem. Phys., 14, 10439–10464, 2014 /14/10439/2014/ doi:10.5194/acp-14-10439-2014-supplement © Author(s) 2014. CC Attribution 3.0 License. Supplement of Volatile and intermediate volatility organic compounds in suburban Paris: variability, origin and importance for SOA formation W. Ait-Helal et al. Correspondence to: A. Borbon (agnes.borbon@lisa.u-pec.fr) 1 Supplementary material S1: Determination of hexadecane partition coefficient Kp. 2 3 The gas-phase partitioning constant of a compound i, Kp,i , is defined as (Pankow, 1994): 4 With f om the fraction of total aerosol mass that is organic matter, R the gas constant (8.2 × 10‐ 5 3 1 1 5 m‐ atm mol‐ K‐ ), T the ambient temperature (K), MWom the average molecular weight of 1 6 organic matter in the aerosol (g mol‐ ), the activity coefficient of the compound i, the 7 liquid vapor pressure of compound i (Torr). 8 Table S1 presents the different parameters needed for the determination of Kp,hexadecane from 9 the SIRTA measurements. Concerning , we determined it from the vapor pressure 10 available in the Reaxys database (/online-tools/reaxys); we corrected 11 it for temperature using Clausius-Clapeyron relationship (Williams et al., 2010). MWom has 12 not been determined for the MEGAPOLI experiments. Williams et al. (2010) have determined 1 13 a value of 200 g mol‐ from ambient measurements of the particulate matter at the University 14 of California, Riverside (USA). Their sampling site is located near an important highway 15 (Docherty et al., 2011). Hence, the influence of traffic and more generally of the l