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首页> 外文期刊>Chemical Science International Journal >Differential Pulse Polarography Method for the Determination of Trace Fe, Ni, Pb, Zn, Se and Cu in Black Tea Leaves
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Differential Pulse Polarography Method for the Determination of Trace Fe, Ni, Pb, Zn, Se and Cu in Black Tea Leaves

机译：差分脉冲极谱法测定痕量Fe，Ni，Pb，Zn，Se和Cu在黑茶叶中的含量

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In this work a new and simple polarographic method has been established for the determination of trace elements present in tea. After digestion with acids, tea samples were analyzed using various electrolytes such as acetate and ammonia at different pH values in the presence or absence of EDTA. Thus, it was possible tochoosethe best medium for the determination of6 trace elements in one tea sample. Polarographic peaks of copper and iron could be separated in HAc at about pH =7 in the presence of EDTA and their quantities were determined. Ni and Zn peaks could be separated and determined in ammonia buffer at about pH= 10. Lead could be determined at pH= 2HAc electrolyte. Selenite, was determined from its hydrogen catalytic peak in KCl, pH= 2 medium in the presence of Mo (VI). The LOD was found as 2.4x10~(-7) for instead of (S/N=3).The trace element ranges in black tea were found as, Fe 35 μg/g, Cu 45 μg/g, Ni 19 μg/g, Zn? 22 μg/g, Pb 28 μg/g and Se 77? μg/g.
机译：在这项工作中，已经建立了一种新的和简单的极谱方法，用于确定茶中存在的微量元素。在用酸消化后，使用各种电解质如乙酸盐和氨在不同的pH值中使用各种电解质进行分析茶样品，在存在或不存在EDTA的情况下。因此，可以进行最佳培养基，用于测定一茶样品中的6种微量元素。在EDTA存在下，在HAC下，可以在HAC下分离铜和铁的极谱峰值，并且测定它们的量。可以分离Ni和Zn峰并在约pH = 10的氨缓冲液中确定。铅可以在pH = 2HAC电解质中测定。在Mo（VI）存在下，从其氢气催化峰确定在KCl，pH = 2培养基中。为代替（s / n = 3）发现LOD作为2.4x10〜（-7）。发现黑茶中的痕量元素范围为Fe35μg/ g，Cu45μg/ g，Ni19μg/ g，zn？ 22μg/ g，pb28μg/ g和se 77？ μg/ g。

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