电感耦合-等离子体发射光谱法测定枸橼酸铁铵中铝残留量

摘要

目的 建立测定枸橼酸铁铵中铝残留量的电感耦合-等离子体发射光谱法(ICP-OES).方法 检测波长为396.153 nm,高频入射功率为1.3 kW,雾化器流速为0.6 L/min,泵速为1.5 mL/min.结果 铝质量浓度在0~5.0μg/mL范围内与吸收强度线性关系良好,线性回归方程为A=847400 C-683.8,r=0.999994(n=6);平均回收率为96.19%,RSD为2.39%(n=6);检出限为0.028μg/mL,定量限为0.085μg/mL.结论 该方法迅速准确,专属性良好,灵敏度高,可用于枸橼酸铁铵铝残留量的控制.%Objective To establish an ICP-OES method for determination of aluminum residue in ferric ammonium citrate. Methods The detection wavelength was, the optimal high frequency input power was 1. 3 kW, the flow rate of the atomizer was 0. 6 L/min, and the pump speed was 396. 153 nm 1. 5 mL/min. Results The mass concentration of aluminum in the range of 0-5 μg/mL has a good linear relationship with the absorption intensity. The linear regression equation was A=847400 C-683. 8, r=0. 999994( n=6), the average recovery was 96. 19%( n=6), The RSD was 2. 39%( n=6). The detection limit was 0. 028 μg/mL and the limit of quantification was 0. 085 μg/mL. Conclusion The method is rapid, accurate, specific and sensitive, which can be used for the control of aluminum residue in ferric ammonium citrate.