原子吸光法による茶葉中の重金属の分析

概要

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The amounts offour essential trace elements, Fe, Cu, Zn, and Mn, in 26 kinds of tea leaves were determined by a flame atomic absorption spectrophotometry. High contents of Fe (90.7〜110.1ppm) were found in the green teas produced with Yabukita cultivar grown in the west area of Makinohara in Shizuoka and in all kinds of the oolong teas used in this study. High contents of Cu (15.6〜47.1ppm) were found in some of the green teas, the oolong teas, and the black teas and in a roasted green tea, Houji-cha, used in this study. High contents of Zn (39.0〜42.7ppm) were found in many of the green teas produced with Yabukita cultivar grown in Shizuoka and with Yutakamidori cultivar grown in Kagoshima. High contents of Mn (72.4〜77.4ppm) were also found in many of the green teas produced with Yabukita cultivar grown in Shizuoka and with Yutakamidori cultivar grown in Kagoshima as same as the contents of Zn. Inversely, low contents of Mn were found in 3 kinds of tea leaves in which the contents of Cu were high. Since the metal contents in tea leaves are affected by many factors, such as the cultivation processes, the cultivars, the localities, the seasons for picking, etc., the data of many kinds of tea samples should be accumulated for the examination about the amounts of metals in tea leaves.
沼津工業高等専門学校の論文
2006-01-31