Effect of ozone on nicotine desorption from model surfaces: evidence for heterogeneous chemistry.

摘要: Assessment of secondhand tobacco smoke exposure using nicotine as a tracer or biomarker is affected by sorption the alkaloid to indoor surfaces and its long-term re-emission into gas phase. However, surface chemical interactions have not been sufficiently characterized. Here, reaction ozone with sorbed Teflon cotton was investigated in an environmental chamber monitoring desorption over week following equilibration dry humid air (approximately 0% 65-70% RH, respectively). The had N2-BET areas 0.19 1.17 m2 g(-1), water mass uptakes (at 70% RH) 0 7.1% respectively. Compared baseline levels absence O3, gas-phase concentrations decreased 2 orders magnitude for after 50 h at 20-45 ppb factor 10 100 13-15 O3. ratios pseudo first-order rate constants (r) (k) were r/k = 3.5 2.0 surfaces, These results show that oxidation competitive desorption. Hence, oxidative losses could significantly reduce re-emissions from surfaces. Formaldehyde, N-methylformamide, nicotinaldehyde, cotinine identified products, indicating pyrrolidinic N site electrophilic attack presence vapor no effect on nicotine-O3 By contrast, unaffected ozone. observations are consistent complete inhibition ozone-nicotine reactions aqueous film present but