Comparative Study on Iron Content Analysis Techniques in Tea
In this study,phenanthroline spectrophotometry and graphite furnace atomic absorption spectroscopy were used to determine the iron in Mingqian green tea,Dahongpao tea and Pu'er tea.Under the optimized experimental conditions,spectrophotometry and graphite furnace atomic absorption spectroscopy had a good linear relationship between the concentration in the range of 0～2.000 0 μg/mL and 0～5.000 0 μg/mL respectively of iron and the absorbance value.The recoveries of spectrophotometry and graphite furnace atomic absorption spectroscopy were 97.3％～103.8％and 97.6％～102.9％,respectively.The RSD was less than 5％.
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