电感耦合等离子体发射光谱法测定面制食品中的铝

建立电感耦合等离子体发射光谱法检测面制食品中铝含量的方法。以硝酸-过氧化氢作为消解体系,样品经微波消解后以5%硝酸定容,测定。对仪器条件进行了优化,铝的分析谱线为396.153 nm,射频功率为1 150 W,雾化气流量为0.5 L/min。铝的质量浓度(X)在0.5~10 mg/L范围内与谱线强度(Y)线性良好,工作曲线方程为Y=1 743.2X+58.0,线性相关系数r=0.999 9;测定结果的相对标准偏差小于5%(n=6),加标回收率为92.8%~107.0%。用该方法与标准方法对面食样品进行测定,两种方法测定结果相一致。该方法简便、灵敏、准确,适用于面制食品中铝含量的测定。

Determination of Aluminum in Wheaten Food by Inductively Coupled Plasma Atomic Emission Spectrometry

A method for the detemination of aluminum content in wheaten food by inductively coupled plasma atomic emission spectrometry was developed. The sample was dissolved by nitric acid and hydrogen peroxide, then diluted to the volume by 5% nitric acid solution after microwave digestion. The experiment conditions were optimized. The analytical spectral line of aluminum was 396.153 nm,RF power was 1 150 W,and atomizing gasflow was 0.5 L/min. The mass concentration of aluminium(X) was linear with emission intensity(Y) in the range of 0.5–10 mg/L. The linear regression equation wasY=1 743.2X+58.0, with correlation coefficient of 0.999 9. The relative standard deviation of detetion results was less than 5%(n=6), the added recovery was 92.8%–107.0%. Aluminum content of wheaten food was determined by this method and standard method, determination results by two methods was consistent. This method is simple, sensitivity and accurate,it can be used to determine aluminum content in wheaten food .