The Application of Atomic Absorption Spectrometry to Organic Analysis(Ⅲ)──Determination of Tannins in Tea

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (4): 536.

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The Application of Atomic Absorption Spectrometry to Organic Analysis(Ⅲ)──Determination of Tannins in Tea

WANG Ji-De¹, TIAN Li-Qing², WANG Lian-Sheng²

1. Department of Chemistry, Xinjiang University, Urumqi, 830046;
2. Center of Modern Analysis, Nanjing University, Nanjing

Received:1994-04-22 Revised:1994-08-16 Online:1995-04-24 Published:1995-04-24

Abstract

Abstract: In this paper,a new indirect method for determining tannins in tea by atomic absorption spectrometry is studied. Tannins in tea is extracted with mixed extractant of methyl isobutyl ketone(MIBK)and butyl alcohol and separated from the sample solution,then Cu₃(PO₄)₂reagent is added to react with tannins in organic phase,the uncosumed reagent is centrifuged to subside, the Cu in supernatant is determined by AAS, and the concentration of tannins in tea is obtained. The interference of coexisting amino acid can be eliminated by this method,and the results of official method and ours show no difference,the recoveries are between 94%-104%,and the avarage relative standard deviation is 3.1%.

Key words: Atomic absorption spectromitry, Tannins, Tea

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WANG Ji-De, TIAN Li-Qing, WANG Lian-Sheng. The Application of Atomic Absorption Spectrometry to Organic Analysis(Ⅲ)──Determination of Tannins in Tea[J]. Chem. J. Chinese Universities, 1995, 16(4): 536.

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The Application of Atomic Absorption Spectrometry to Organic Analysis(Ⅲ)──Determination of Tannins in Tea

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