摘要: The purpose of this study was to investigate the filtration and retention characteristics of crotonaldehyde in various cigarette filters. The filtration efficiencies of crotonaldehyde were evaluated in regular cellulose acetate (CA) filter under ISO and Health Canada Intense (HCI) smoking regimes. In addition, filter designs with outer grooved CA filter, inner grooved CA filter, paper/CA composite filter, and ventilation cavity CA filter, were investigated under ISO smoking regime. The influences of the smoking regime and the filter structure on crotonaldehyde filtration behaviors were investigated by its spatial retention distribution pattern. The filtration and retention characteristics of crotonaldehyde in these filters were further evaluated by on-line monitoring of smoke temperature flowing through the filter and puff-by-puff crotonaldehyde concentration distribution patterns. The results showed that: 1) The order in filtration efficiency of crotonaldehyde in different filters under ISO smoking regime (from high to low) was: regular CA filter > outer grooved CA filter ≈ inner grooved CA filter > paper/CA composite filter > ventilation cavity CA filter. The filtration efficiency of crotonaldehyde in regular CA filter was significantly reduced under the HCI smoking regime. 2) Filter structure had a notable effect on crotonaldehyde longitudinal concentration distribution pattern in filters, which were distinctly different from those of nicotine, phenol and other smoke components. 3) The puff-by-puff crotonaldehyde retention pattern and smoke temperature on-line monitoring results showed that there was an adsorption-desorption-adsorption process for crotonaldehyde during smoking, and this could partially account for the differences in concentration distribution pattern between crotonaldehyde and other smoke components.