原子捕集-火焰原子吸收光谱法测定中草药中的锰和锌

利用原子捕集-火焰原子吸收光谱分析技术,建立了锌和锰的测定方法,考察了捕集管位置、火焰条件、冷却水流量等实验条件对方法灵敏度的影响,优选出了测定锌、锰的最佳实验条件.在最佳实验条件下,捕集5 min,锌的特征质量浓度为0.69μg/L;捕集4 min,锰的特征质量浓度为2.32μg/L,分别比常规火焰原子吸收光谱法提高78和27倍.

Determination of Zinc and Manganese in Chinese Herbs by Atomic Absorption Spectrometry Using the Atom Trapping Technique

A method had been proposed for the determination of zinc and manganese by flame atomic absorption spectrometry (FAAS) using atom trapping technique. The conditions that affected on the absorbance , such as the trap position, the flame conditions, and the coolant flow rates were studied. For 5 min collection time, the characteristic concentration of zinc was 0.69 μg/L; For 4 min collection time the characteristic concentration of manganese was 2.32 μg/L, which were 78 and 27 times than the sensitivity of conventional flame atomic absorption spectrometry, respectively.