茶叶中微量营养元素的原子吸收光谱分析

DETERMINATION OF SEVERAL MINOR NUTRIENT ELEMENTS IN TEA BY ATOMIC ABSORPTION SPECTROMETRY

茶叶中的微量元素与茶叶的营养和药理作用有密切关系,与茶树生长的生化活动也有密切关系。对茶叶中的微量营养元素的分析有助于了解茶叶的品质,研究茶叶的营养药理作用,促进茶叶生产的发展。为此,我们研究提出了用火焰原子吸收光谱法测定茶叶中铜、锰、铁、锌,方法简便、准确。

A convenient and accurate method for the determination of copper,manganese,iron and zinc in tea by aspirating directly the sample solution into a flame atomic absorption spectrometer is described.The conditions of dry ashing of the tea leaves and preparation of the sample solution have been studied.The interference of other ions contained in the sample solution has been examined and found to be negligble.A standard addition method has been made and the results obtained are in agreement with that of the standard curve method.The recovery and the precision of this method are quite satisfactory.Finally,twenty-live different samples of famous china tea have been analysed by this method,and the content ranges of copper,manganese,iron and zinc in these samples are Cu 9-65,Mn 185-1600,Fe 105-320,and Zn 35-93 ppm.