火焰原子吸收光谱法测定女贞子中的微量金属元素

Determination of Trace Metals in the Ligustrum Lucidum by Flame Atomic Absorption Spectrophotometry

摘要: 采用干法灰化女贞子样品，用火焰原子吸收光谱法测定样品中的金属元素Mn、Fe、Zn的含量，考察了检测方法的精密度、检出限、加标回收率，结果显示: 女贞子中的Mn、Fe、Zn的含量范围分别是19.97 ~ 21.74 μg·g^-1，291.46 ~ 323.68 μg·g^-1，52.17 ~ 57.83 μg·g^-1; 3种元素的RSD分别为0.631%，0.072%，0.160%;3种元素的LOD分别为0.001 9，0.015 9，0.002 8;几种元素的加标回收率在99.74% ~ 102.34% 之间。结果说明: 火焰原子吸收法测定女贞子中微量元素方便、快捷、准确，是研究中药中微量金属元素含量的有效方法。

Abstract: The Ligustrum lucidum samples were prepared by dry digestion process. The content Mn, Fe and Zn in ligustrum lucidum were determined by flame atomic absorption spectrophotometry. The recovery of standard addition, precision and detection limit of the method is investigated. The results showed that the content of Mn, Fe and Zn in ligustrum lucidum was 19.97-21.74 μg·g^-1, 291.46-323.68 μg·g^-1 and 52.17-57.83 μg·g^-1 respectively. The recovery of standard addition was 99.74%-102.34% with precision of 0.631%, 0.072% and 0.160% (n = 10) and limit of detection of 0.0019, 0.0159 and 0.0028. The FAAS has the advantages of automation, convenience, quickness and accuracy for the determination of trace metals in traditional Chinese medicine.