ICP-AES测定茶包中总铝及水溶性铝的含量

目的：建立电感耦合等离子体原子发射光谱法（ICP-AES法）测定茶包中总铝及水溶性铝含量。方法：样品经微波消解消化处理，采用ICP-AES法测定茶包中总铝及水溶性铝含量，样品导入泵速30 r·min^-1，功率1 100 W，等离子气流量15.0 L·min^-1，辅助气流量1.5 L·min^-1，雾化器压力200 kPa，载气为高纯氩气，以内标法计算，选择待测元素铝波长为396.152 nm，内标钪波长为361.383 nm。结果：ICP-AES法测定茶包中铝元素，线性范围为0~25 mg·L^-1（校准曲线相关系数r=0.999 7）；加样回收率平均值（n=9）为95.6%，RSD为1.3%；检测限为0.6 mg·kg^-1；重复性RSD为1.3%（n=6）；总铝含量范围为117~1 046 mg·kg^-1，水溶性铝含量范围为36~367 mg·kg^-1。结论：本法适用于茶包中总铝及水溶性铝的含量测定。第1次冲泡的茶水中铝含量较高。

Objective: To establish an ICP-AES method for the quantitative analysis of total aluminium and water soluble aluminium in tea bags. Methods: Microwave digestion was used for sample pre-treatment. The content of total aluminium and water soluble aluminium were measured by internal standard method using ICP-AES,respectively. The pump speed was 30 r·min^-1. The power was 1 100 W. The flow rate of plasma gas was 15.0 L·min^-1. The flow rate of auxiliary gas was 1.5 L·min^-1. The nebulizer pressure was 200 kPa,and the carrier gas was high purity argon. The wavelength of Al was set at 396.152 nm and the wavelength of Sc as the internal standard element was 361.383 nm. Results: The calibration curve of total aluminium in tea bags has good linearity between 0 mg·L^-1 and 25 mg·L^-1 (calibration curve correlation coefficient r=0.999 7). The mean recovery rate (n=9)was 95.6% and the RSD was 1.3%. The detection limit of the method was 0.6 mg·kg^-1. The repeatability of RSD was 1.3% (n=6). The amount of total aluminum ranged from 117 to 1046 mg·kg^-1. The amount of water soluble aluminium ranged from 36 to 367 mg·kg^-1. Conclusion: This method is suitable for the quantitative analysis of total aluminium and water soluble aluminium in tea bags. The amount of water soluble aluminium in tea bags for the first time was higher.

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