微波消解-电感耦合等离子体发射光谱法测定食品中锡含量的方法研究

Research on determination of tin in food by inductively coupled plasma optical emission spectroscopy with microwave digestion

中文关键词:  锡  盐酸  微波消解  电感耦合等离子发射光谱法

英文关键词:tin  hydrochloric acid  microwave digestion  inductively coupled plasma optical emission spectroscopy

中文摘要:

      目的 建立微波消解-电感耦合等离子体发射光谱法(inductively coupled plasma optical emission spectroscopy, ICP-OES)测定食品中锡含量的方法。方法 采用5 mL硝酸+1 mL盐酸的酸体系对样品进行微波消解前处理, 并在90 ℃下赶酸, 再用电感耦合等离子发射光谱法以189.925 nm为分析谱线, 测定食品中锡含量。结果 该方法线性范围为0.01~ 5.00 mg/L, 相关系数大于0.999。方法检出限为0.7 mg/kg, 方法定量限为2.4 mg/kg, 多种基质样品的结果相对标准偏差＜5%, 加标回收率在100.2%~109.4%。结论 该方法操作简便快捷, 结果准确, 精密度高, 灵敏度高, 干扰少, 适用于食品中锡的分析。

英文摘要:

      Objective To establish a method for the determination of tin in food by microwave digestion-inductively coupled plasma optical emission spectrometry (ICP-OES). Methods The samples were pretreated with 5 mL nitric acid and 1 mL hydrochloric acid before microwave digestion. The samples were driven out of acid at 90 ℃, and then the content of tin in food was determined by ICP-OES with 189.925 nm as the analytical line. Results The linear range of this method was 0.01–5.00 mg/L with correlation coefficient greater than 0.999. The method detection limit was 0.7 mg/kg, the quantification limit was 2.4 mg/kg. The relative standard deviation of the results of multiple matrix samples was less than 5%, and the spike recovery was 100.2%-109.4%. Conclusion The method is simple to operate, with accurate results, high precision, high sensitivity and less interference, and is suitable for the analysis of tin in food.