碰撞池-电感耦合等离子体质谱法测定食品添加剂中的微量铝

目的 建立碰撞池—电感耦合等离子体质谱法测定食品添加剂中微量铝含量的方法,了解市售面制食品添加剂中铝含量现状。方法 采用泡打粉、酵母、小苏打等样品经过微波消解后,用氦气作为反应气,在线加入_⁴⁵Sc内标校正基体效应, ICP-MS法测定样品中铝的含量,添加回收率来验证方法的准确性与可靠性。结果 工作曲线线性回归系数为0.9991,方法检出限为0.32 ug/L,测定结果的相对标准偏差小于6.62% (n=6),回收率在86.8% ~ 101.3%之间。结论 方法检出限低、准确度高,适用于食品添加剂中微量铝含量的测定和监控。通过对市售食品添加剂中铝的检测,为合理监管含铝食品添加剂及评估其对人体食品安全风险暴露水平提供科学依据。

Determination of trace aluminum in food additives by inductively coupled plasma-mass spectrometry with octopole reaction system

Objective To establish a method for the determination of trace aluminum in food additives by octopole reaction system (ORS)-inductively coupled plasma-mass spectrometry (ICP-MS), and master the current situation of aluminum content in food additives for sale. Methods After microwave digestion of baking powder, yeast, baking soda and other samples, helium was used as reaction gas, 45Sc internal standard was added online to correct matrix effect, and aluminum content in samples was determined by ICP-MS, and recovery was added to verify the accuracy and reliability of the method. Results The correlation coefficient of the method was 0.9991 and the linear relationship was good, and the detection limit was 0.08 mg/kg. Relative standard deviation (RSD, n=6) was less than or equal to 6.62% and recoveries from 86.8%?101.3% were obtained. Conclusion The method with advantage of low detection limit and high accuracy can be applied to the determination and monitoring of trace aluminum in food additives. There is a potential safety hazard in the exposure of aluminum in food additives, and relevant departments should strengthen supervision on the use of these additives.