微波消解—电感耦合等离子体质谱法测定膨化食品中铝

Detection of aluminium in puffed food by microwave digestion with inductively coupled plasma- mass spectrometry

建立了微波消解—电感耦合等离子体质谱法测定膨化食品中铝的方法。采用微波消解法处理膨化食品,利用内标元素补偿基体效应,结合动态反应池技术消除质谱干扰,进行电感耦合等离子体质谱分析。在优化的实验条件下,铝元素在0.1~1.0 mg/L的浓度范围内呈良好线性关系,相关系数r=0.999 7,检出限为0.023 mg/L(n=11),加标回收率为90.8%~103.0%,相对标准偏差为0.4%~3.2%。本方法具有快速、简单、准确、灵敏度高等特点,适合膨化食品中铝的测定。

The determination of aluminum in puffed food by microwave digestion -inductively coupled plasma -mass spectrometry was established.The puffed food was treated by microwave digestion,with internal standard elements to compensate matrix effect,combined with the dynamic reaction cell technolo-gy to eliminate the interference of mass spectrometry,analyzed by inductively coupled plasma mass spec-trometry.Under the optimal experimental conditions,aluminum showed a good linear relationship in the concentration range of 0.1 ~1.0 mg/L,the linear correlation coefficient r =0.999 7,the detection limit 0.023 mg/L (n =11),the recovery of standard addition 90.8% ~103.0%,relative standard deviation 0.4% ~3.2%.This method is rapid,simple,accurate and high sensitivity,etc.,which was suitable for the determination of puffed food.