3. Results
3.1. Kitchen cleaning agent
Limonene and dihydromyrcenol were the most abundant reactive
VOCs in ratio 3 to 1, while butoxyethoxy ethanol was the second most
abundant VOC; other reactive VOCs were also present, but in minor
amounts (Table 2).
Amaximumlimonene concentration about 550 μg/m3 (99 ppb) was
measured within the first 30 min upon application of KCA at the low
ozone test concentration (Fig. 1a). This dropped to 350 μg/m3
(63 ppb) at the high ozone test concentration, which indicates
fast ozonolysis and inter alia condensation of VOCs on generated SOA
(Figs. 1b and 2b). Likewise, the observed difference in 1-(2-
butoxyethoxy) ethanol concentration maxima between low and high
ozone test conditions may be explained by condensation on SOA. A
difference in concentration maxima was also observed for glycol and
glycol ethers in PIAF (see below). A reduction of dihydromyrcenol to
about one third at the high ozone test concentration was observed
relative to the low ozone test condition.