2014•Guangdong nongye kexueOpen access

Determination of Trace Elements in Shangluo Green Tea by FAAS with Microwave Digestion

HE Nian-w

Abstract

Taking nitric acid plus hydrogen peroxide as digestive solution,through adopting the method of flame atomic absorption spectrophotometry(FAAS) with microwave digestion,this study determined the contents of 6 kinds of trace elements(Se,Fe,Mn,Zn,Mg,Cu) in Shangluo green teas from different producing areas.The results showed that the standard-adding recovery rates of determined 6 trance elements were from 98.30% to 102.40%.The relative standard deviations in the determination of these trace elements ranged from 0.73% to 2.81%.Through determination by this method,the contents of Se,Fe,Mn,Zn,Mg and Cu in green tea samples were 2.63 ~ 5.23,96.86 ~ 112.21,193.44 ~ 231.18,56.34 ~ 73.15,164.53 ~ 183.92,and 11.62 ~17.11 μg/mL respectively.

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Key concepts: Nitric acid, Chemistry, Microwave digestion, Hydrogen peroxide, Green tea, Atomic absorption spectroscopy, Relative standard deviation, Digestion (alchemy)