电感耦合等离子体原子发射光谱法测定食品添加剂硫酸锌中铁、锰、铅、镉

Determination of Fe, Mn, Pb and Cd in food additive zinc sulphate by inductively coupled plasma optical emission spectrometry

目的建立一种用电感耦合等离子体原子发射光谱法（ICP-OES）测定食品添加剂硫酸锌中铁、锰、铅、镉的方法。方法试样用水溶解后,采用电感耦合等离子体发射光谱法测定试液中铁、锰、铅、镉的含量,标准曲线法定量。结果试样中铁、锰、铅、镉的检测限分别为0.5 mg/kg、0.1 mg/kg、0.1 mg/kg、0.1 mg/kg。重复性和精密度好,RSD〈5%,回收率在90%~120%,符合国标要求。样品检测结果与国家标准方法的结果基本一致。结论本方法操作简便,结果准确可靠。适用于食品添加剂硫酸锌中多种杂质元素的高通量、快速检测。

Objective To establish a method for the determination of Fe, Mn, Pb and Cd in food additive zinc sulphate by inductively coupled plasma optical emission spectrometry （ICP-OES）. Methods Samples were dissolved by water, and then the content of Fe, Mn, Pb and Cd was determined by ICP-OES using standard curve method. Results The detection limit of Fe, Mn, Pb and Cd in the sample was 0.5 mg/kg, 0.1 mg/kg, 0.1 mg/kg and 0.1 mg/kg, respectively. The results showed that this method had good precision （RSD〈5%, recovery rate 90%-120%） in line with the national standard. The results of the sample test were consistent with the national standard method. Conclusion The method is rapid, simple, accurate and credible. It is suitable for the high-throughput and quick determination of impurities in zinc sulphate.