The Contents of Fifteen Essential, Trace and Toxic Elements in Some Green Tea Samples and Their Infusion

The content of fifteen elements i.e. Ca, Mg, Na, K, Fe, Mn, Zn, Co, Cu, Cr, Ni, Pb, Cd, Ba and Al were determined for 30 samples from three types of green tea samples using flame atomic absorption spectroscopy. The samples were purchased from authentic tea dealer in Peshawar imported from India, China and Kenya. However, some samples were taken which were locally produced in Pakistan with branded packing and without package. The NBS tea leaves. The wet digestion and infusion procedure reference material was also analyzed simultaneously with tea samples. The wet digestion and infusion procedures were also employed for determi8nation of total and aqueous extracted elements are elements are present in total in tea infusion. The levels of toxic metals are low but levels of aluminum are high in both forms. The results obtained form this analyzed have shown good accuracy and reproducibility. The relative error and relative standard deviation were less than 19% for most of the elements analyzed

T G KAZI ,G H KAZI ,M A JAKHARANI ,Q G SHAR ,S SHAIKH ,