[目的]考察不同功率条件下雾化器重复使用时电子烟气溶胶中Ni、Cr、As、Pb及Cu的释放规律.[方法]选取功率可调型电子烟6种,重复使用雾化器,连续3天检测不同功率下每20口气溶胶中重金属的释放量,分析其时间序列图.[结果](1)低功率下,雾化器的重复使用对气溶胶中重金属的释放量均无明显影响;(2)高功率下,Ni、Cr的释放量随雾化器日内使用次数的增多而降低,As、Pb、Cu影响不明显;(3)在相同条件下,Ni、Cr、As、Cu的释放量随功率升高而增大,但Pb的释放量不随功率而变化.

建立了金捕集-电感耦合等离子体质谱法同时测定电子烟气溶胶中铬、镍、砷、铅、镉、锑、汞7种重金属元素的方法.实验优化了电子烟气溶胶的捕集条件,采用含2.0 mg/L金元素的5.0％(体积比)硝酸溶液捕集吸收气溶胶,捕集阱为2瓶串联,每个捕集阱含吸收液25.0 mL,抽吸口数为100口.结果 表明,电子烟气溶胶中的铬、镍、砷、铅、镉、锑和汞均能得到有效捕集.在优化条件下,铬、镍、砷、铅和镉的线性范围为0.3～ 80 μg/L,锑和汞的线性范围为0.3～ 10μg/L,其相关系数(r2)均大于0.999,检出限为0.69 ～ 1.19 ng/100 puffs,定量下限为2.29 ～ 3.97 ng/1 00 puffs,方法的回收率为96.5％ ～ 103％,相对标准偏差(RSD)为6.6％～14％.使用该方法与法国标准方法对市售的10种电子烟样品进行测定,两种方法的检测数据基本一致.该方法准确、可靠、高效、使用试剂少,可用于电子烟气溶胶中多种重金属的检测.

In order to explore relationships between heavy metal migration ratios in mainstream cigarette smoke and their forms in tobacco leaves,contents of different heavy metals (Cr、Ni、As、Se、Cd),their four forms,corresponding unblended mainstream cigarette smoke and TPM in 24 samples from different areas and different parts were studied.Statistical analysis of data was conducted by using least square method and advantage analysis method,and the influence rule of different forms of heavy metals on their migration ratios in mainstream smoke was revealed.Results showed that effects of different forms of heavy metals and TPM on their migration rates in mainstream smoke were in the following order,Cr:fraction of soluble state(inorganic state) (+) ＞fraction of insoluble state (-) ＞TPM (+);Ni:fraction of organic state (+) ＞ fraction of inorganic state (-) ＞fraction of insoluble state (+) ＞ TPM (+);As:TPM (+) ＞ fraction of organic state (+) ＞fraction of inorganic state (+) ＞ fraction of insoluble state (-);Se:fraction of inorganic state (+) ＞TPM (+) ＞ fraction of insoluble state (-) ＞ fraction of organic state (-);Cd:TPM (+) ＞ fraction of organic state (-) ＞ fraction of insoluble state (+) ＞ fraction of inorganic state (+).The plus or minus in the bracket stands for the positive or negative correlation.A theoretical explanation of the above results was proposed by taking into consideration the combustion mechanism of cigarettes,physical properties and occurrence forms of heavy metals and other factors.

建立了电感耦合等离子体质谱仪(ICP-MS)测定口含烟中钠的方法,并对影响测定结果的主要因素进行了优化.结果表明,方法检出限和定量限分别为0.553 4和1.845 μg/Kg,平均回收率为92.00％ ～ 97.63％,RSD低于5.535％(n=6).应用方法对不同品牌的口含烟样品进行了检测,结果显示,不同品牌口含烟中钠含量水平差异明显.