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Determination of Tea Tannin by Indirect Atomic Absorption Spectrometry

Du Xiaoyan,Guan Chunmei,Shi Zhongcheng and Li Xiangzhou(Public Health Institute,Harbin Medical University,Harbin 150001)  
A new indirect atomic absorption spectrometric method for the determination of tea tannin was established based on the precipitatiopn of tannin with copper acetate and measurement of excess free copper.The proposed method was fast,convenient,less in intreferences and simple in sample preparation.The calibration graph was linear over the range of 1~40mg/L tannic acid and the relative standard deviation for the determination of 10mg/L tannic acid (n=7) was 3.16%.The method has been successfully applied to the determination of tannin in 5 kinds of teasamples
【CateGory Index】: O657.31
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