Study On The Filtration Efficiencies Of Cigarette Filters Of Some Compounds In Main Stream Smoke

The mainstream cigarette smoke is very complex; including many harmful components. Due to the selectively filter some harmful components in the mainstream cigarette smoke by the cigarette filter, the research on the filtration efficiencies of cigarette filters is a important aspect of the less harmful and lower tar cigarette. This paper mainly studies the filtration efficiencies of cigarette filters for low molecular aldehydes and ketones, Benzo (a) Pyrene of Polycyclic Aromatic Hydrocarbons and hydrogen cyanide. Filtration effieiencies of these components in cigarette filters by different filters and smoking style are studied.to giving a scientific basis and technological support of the selection of filter. The study results as follow:(1)The filtration efficiencies of cigarette filters for low molecular aldehydes and ketones was detected by high performance liquid chromatography. The cigarette smoke was collected using a Cambridge pad and treated with acidic solution of2,4-dinitrophenylhydrazine. The eight low molecular aldehydes and ketones were extracted from the Cambridge filter with2%pyridine acetonitrile solution, the samples were analysed by high performance liquid chromatography and after shaked. The cigarette filtes were extracted by DNPH-method. The result shows that:The recovery tapped in different filters ranged from85.7%to92.4%with relative standard deviations (RSD) of less than5.74%and the detection limits range from0.06μg/cig to0.15μg/cig while the Limit of quantification of eight compounds range from0.20μg/cig to0.51μg/cig. This method is accurate, stable and with good reproducibility, high feasibility.(2)The efficiencies of the Benzo (a) Pyrene of mainstream cigarette trapped in cigarette filters were analyzed by gas chromatography/mass spectrometry (GC/MS). The Pretreatment method of the filters was the same as the Cambridge pad. All samples were extracted ultrasonically with internal-standard added cyclohexane, purified by solid-phase extract culoum and condensed to0.5mL, transfered to bottle then analyzing by GC/MS. The Linear Equation of Benzo (a) Pyrene is:y=1.197e+003x-7.340e+003and correlation coefficient is0.9999, the limit of detection and the limit of quantification is0.9ng/mL,3.0ng/mL respectively. The results showed that:The filtration efficiencies of cigarette filters ranged from18.3%to45.8%.(3)The filtration efficiencies of cigarette filters for the Benzo (a) Pyrene in mainstream cigarette smoke were analyzed by ultra-high performance liquid chromatography. The Cambridge pad and the filter’s treatment were the same at the same time:extracted ultrasonically by cyclohexane, the extraction was dry up and resolved by acetonitrile then analyzed by ultra-high performance liquid chromatography instrument, the interception efficiency of filters for different filters and smoking regime whose influencing factors were studied. The linear equation of Benzo (a) Pyrene is:y=1.9479x+39800and correlation coefficient is0.9999, the limit of detection and the limit of quantification is0.10ng/g,0.36ng/mL respectively. The results determinded by UPLC were lower than by GC-MS.(4)The efficiencies of the hydrogen cyanide of mainstream cigarette trapped in ciga rette filters were studied. The hydrogen cyanide in particle part was trapped in Cambrid-ge pad and the gas part was absorbed by Ethylenediamine-Oxyhydrogen sodium solu-tion. quantitative transferred5mL extraction and absorb liquid from particle part and gas part respectively to mix then analyzed by Ion chromatography instrument.The filters were also extracted by Ethylenediamine-Oxyhydrogen sodium solution, then analyzed by Ion chromatography instrument after shaked. The linear equation of hydrogen cyanide is:y=8.7433x+1.4891and correlation coefficient is0.9992, the limit of detection and the limit of quantification is0.05ng/mL and0.17ng/mL respectively.This method has the advantages including rapid analysis, high accuracy, good reproductivity.