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. Atmospheric particulate water is ubiquitous, affecting particle transport anduptake of gases. Yet, research on the effect of water on secondary organicaerosol (SOA) mass yields is not consistent. In this study, the SOA massyields of an α-pinene and m-xylene mixture, at a concentration of60 µg m−3, were examined using an oxidation flow reactoroperated at a relative humidity (RH) of 60 % and a residence time of 160 s. Wet or driedammonium sulfate and ammonium nitrate seed particles were used. By varyingthe amount of seed particle surface area, the underestimation of SOAformation induced by the short residence time in flow reactors was confirmed.Starting at a SOA mass concentration of ∼5 µg m−3, themaximum yield increased by a factor of ∼2 with dry seed particles and onaverage a factor of 3.2 with wet seed particles. Hence, wet particles increasedthe SOA mass yield by ∼60 % compared to the dry experiment. Maximumyield in the reactor was achieved using a surface area concentration of ∼1600 µm2 cm−3. This corresponded to a condensationallifetime of 20 s for low-volatility organics. The O:C ratio of SOA onwet ammonium sulfate was significantly higher than when using ammoniumnitrate or dry ammonium sulfate seed particles, probably due to differencesin heterogeneous chemistry.

Effect of salt seed particle surface area, composition and phase on secondary organic aerosol mass yields in oxidation flow reactors