Abstract:
The content of fifteen elements i.e. Ca, Mg, Na, K, Fe, Mn, Zn, Co, Cu, Cr, Ni, Pd, Cd, Ba and Al were determined for 30 sample 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 analysed simultaneously with tea samples. The wet digestion and infusion procedures were employed for determination of total elements and aqueous extracted elements respectively. It was found that, considerable amount of essential and trace elements are present in total in tea infusion. The levels of toxic metals are low but level of aluminum is high in both forms. The results obtained form this analysis have shown good accuracy and reproducibility. The relative error and relative standard deviations were less than 10% for most of the elements analysed.
Page(s):
43-48
DOI:
DOI not available
Published:
Journal: Journal of Chemical Society of Pakistan, Volume: 27, Issue: 1, Year: 2005