火焰原子吸收分光光度法测定普洱茶中金属元素的含量

Determination on the Content of Metal Elements in Puer Tea by Flame Atomic Absorption Spectrophotometry

[目的]采用火焰原子吸收分光光度法测定普洱茶中金属元素的含量。[方法]普洱茶样品经粉碎干燥后,用硝酸-高氯酸混合液进行消解处理,采用火焰原子吸收分光光度法测定K、Ca、Mg、Mn、Fe、Na、Cu、Zn、Cr、Ni的含量。[结果]普洱茶中金属元素的含量为K>Ca>Mg>Mn>Fe>Na>Cu>Zn>Cr>Ni,各元素的加标回收率为98.56%～103.02%,RSD为1.07%～2.97%,准确度和精密度均符合要求。[结论]火焰原子吸收分光光度法测定普洱茶中金属元素的含量是可行的。

[Objective]The research aimed to determine the content of metal elements in Puer tea using flame atomic absorption spectrophotometry（FAAS）.[Method] Puer tea samples were broken and dried,and then were digested by mixtures of HNO3 and HClO4 by wet digestion.And the content of K,Ca,Mg,Mn,Fe,Na,Cu,Zn,Cr and Ni were determined by FAAS.[Result] The contents of 10 kinds of metal elements in Pure tea were KCaMgMnFeNaCu ZnCrNi.The recoveries of standard addition of various experimental elements were 98.56%-103.02%.And their relative standard deviation were 1.07%-2.97%,with the accuracy and precision according to the requirements.[Conclusion] Determination of metal element contents in Pure tea by FAAS was feasible.