ICP-AES测定茶包中总铝及水溶性铝的含量

发布时间：2018-06-09 11:23

  本文选题：电感耦合等离子体原子发射光谱法(ICP-AES) + 茶包　； 参考：《药物分析杂志》2017年05期

【摘要】：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 k Pa,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。
[Abstract]:Objective: to establish an inductively coupled plasma atomic emission spectrometry (ICP-AES) method for the determination of total aluminum and water soluble aluminum in tea bags. Methods: the samples were digested by microwave and the contents of total aluminum and water soluble aluminum in tea bags were determined by ICP-AES. The pump speed is 30 r / min ~ (-1), the power is 1 100 W, the plasma flow rate is 15.0 L / min ~ (-1), the auxiliary gas flow rate is 1.5 L / min ~ (-1), the atomizer pressure is 200 k / a, the carrier gas is high purity argon, the internal standard method is used to calculate the internal standard method, the wavelength of aluminum is 396.152 nm, and the wavelength of internal standard scandium is 361.383 nm. Results the linear range for the determination of aluminum in tea bags was 0 ~ (25) mg / L ~ (-1) (calibration curve correlation coefficient r ~ (0.999 ~ 7). The average recovery was 95.6m ~ (-1); the detection limit was 0.6 mg 路kg ~ (-1) ~ (-1); the RSD was 1.3n ~ (-1); the repeatability was 1.3n ~ (6); the range of total aluminum content was 117 ~ (10) ~ (46) mg 路kg ~ (-1) ~ (-1) and the range of water-soluble aluminum was 36 ~ 367 mg 路kg ~ (-1) ~ (-1). Conclusion: this method is suitable for the determination of total aluminum and water soluble aluminum in tea bags. The aluminum content in the tea water brewed for the first time was higher.
【作者单位】： 江苏省食品药品监督检验研究院;
【分类号】：O657.31;TS272.7
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本文编号：1999558