加热不燃烧卷烟（HNB）烟丝样品经干燥、搅碎和过筛后，分取0.1 g置于锥形瓶中，加入0.05 mol·L^-1盐酸溶液50 mL，超声提取20 min，离心。分取5 mL上清液，定容至50 mL，采用火焰原子吸收光谱法（FAAS）测定其中钙和钠含量；分取1 mL上清液，用水定容至100 mL，用FAAS测定其中钾和镁含量。结果显示，钾、钙、钠、镁的质量浓度均在一定范围内与其对应的吸光度呈线性关系，检出限（3s/k）分别为0.50，0.08，0.02，0.02 mg·kg^-1；对实际样品进行6次平行测定和3个浓度水平的加标回收试验，测定值的相对标准偏差（n=6）均小于5.0%，回收率为90.0%~104%。方法用于5种分别用造纸法、稠浆法、辊压法和干法制备的HNB烟丝样品的分析，发现不同工艺所制样品中4种元素含量差别较大。

After drying, crushing and sieving, 0.1 g of the heat not burning cigarette sample was placed in a conical flask, 0.05 mol·L^-1 hydrochloric acid solution of 50 mL was added to extract for 20 min with ultrasonic. After centrifugation, 5 mL of supernatant was diluted to 50 mL with water for determination of Ca and Na by flame atomic absorption spectrometry (FAAS), and 1 mL of supernatant was diluted to 100 mL with water for determination of K and Mg by FAAS. As found by results, linear relationships between absorbance and mass concentration of the 4 elements were kept in certain ranges, with detection limits (3s/k) of K, Ca, Na, Mg of 0.50, 0.08, 0.02, 0.02 mg·kg^-1; 6 parallel determinations and 3 concentration levels of spike recovery tests were made on actual samples, RSDs (n=6) of the determined values were less than 5.0%, giving results of recovery in the range of 90.0%-104%. The proposed method was used for the analysis of 5 samples,which were prepared by paper-making method, slurry method, rolling method and air-laid method, and the contents of the 4 elements in the samples prepared by different methods were quite different.