电子烟气溶胶中玻璃纤维的测定

为考察电子烟气溶胶中玻璃纤维的结构状态和释放趋势,建立了电子烟气溶胶中玻璃纤维的定性定量分析方法,通过电子显微镜对气溶胶中玻璃纤维进行定性观察,采用电感耦合等离子体质谱仪(Inductively Coupled Plasma Mass Spectrometry,ICP-MS,ICP-MS)定量测定气溶胶中玻璃纤维(以SiO2计)的释放量。按照CORESTA推荐的电子烟抽吸模式抽吸电子烟,通过每轮抽吸30口(连续抽吸4轮,共120口),测定每轮样品的SiO2释放量,比较分析4轮样品之间的玻璃纤维释放量差异。结果表明:①定性方法操作简单,采用该方法易于鉴别玻璃纤维,且结果准确度高;定量方法灵敏度高,准确性和重复性较好。②15种电子烟气溶胶中均有玻璃纤维,其直径分布在7.6~28.3μm之间,长度差别较大,从几何尺寸和物理形态可以推测其为人造玻璃纤维。③电子烟气溶胶中玻璃纤维的释放量为47~432μg/200口。④玻璃纤维的释放量与抽吸口数无关,玻璃纤维的释放呈现无规律、随机的特点。

Determination of glass fiber material in aerosol of electronic cigarettes

In order to analyze the structure and emission of fibrous materials(expressed in the emission of silica)in the aerosol of electronic cigarettes(ECs),qualitative and quantitative methods were developed.The diameter and length of fiber in the aerosol of ECs were identified by microscopic analysis and the emission was determined using inductively coupled plasma mass spectrometry.The effect of puffing parameters on the emission of fiber in aerosol was examined by analyzing the emissions produced from four continuous puffing groups(30 puffs per group,120 puffs in total).The results showed that:1)The developed qualitative method was convenient,easy to distinguish,and accurate.The developed quantitative method was sensitive,accurate,and repeatable.2)The detection rate of fiber in the aerosol of the tested ECs reached 100%.The diameters of fiber identified in the aerosols of all 15 tested ECs ranged from 7.6 to 28.3μm.According to the diameter and length of the fiber identified, these were man-made glass fiber materials. 3) The emission of fiber ranged from47 to 432 μg/200 puffs. 4) The emission of fiber among the four continuous puffing groups showed a generallack of regularity, which suggested that the fiber in the aerosols was released randomly.