烟用香精中重金属铅和砷的分析研究

Analysis of Pb and As in cigarette flavors

运用湿法消解-石墨炉原子吸收光谱法,定量检测烟用香精中重金属铅和砷。实验结果表明,加入基体改进剂后,铅和砷的灰化温度分别为750℃和1600℃,原子化温度分别为1600℃和2000℃。铅和砷定量曲线的相关系数分别为0.9997和0.9999,检出限分别为1.068μg/L和0.394μg/L,相对标准偏差分别为3.83%和3.79%,回收率分别为85.27%-95.83%和89.93%-91.93%。对28个国产烟用香精中的铅和砷含量进行了测定,其中24个样品中铅含量小于3 mg/kg,27个样品中的砷含量小于1mg/kg。

Content of heavy metals lead （Pb） and arsenic （As） in cigarette flavors were determined by atomic absorption spectrometry（AAS） with wet digestion. Results showed that after adding matrix modifiers into the samples, the suitable pyrolysis temperatures of Pb and As were 750 ℃ and 1000 ℃, and the atomic temperatures were 1000 ℃ and 2000 ℃, respectively. The relative coefficients of calibration curve of Pb and As were 0.9997 and 0.9999, respectively. The recoveries of Pb and As were in the range of 85.27 % to 95.83 % and 89.93 % to 91.93 % with the RSD of 3.83 % and 3.79 %, and detection limits of 1.068 μg/L and 0. 394 μg/L, respectively. Pb and As of 28 domestic cigarette flavors were analyzed with the above method. Pb content of 24 samples were less than 3 mg/kg, and As content of 27 samples were less than 1 mg/kg.