Determination of Metal Content in Commercial Tea Products in Vietnam by ICP-OES và AAS

Authors: Nguyễn Thị Thảo*


Tea is a beverage rich in antioxidants, which enhance the immune system of the human body, and prevent diseases such as cancer, cardiovascular disease, obesity. Many metal elements play an important role in the structure of the above-mentioned active ingredients, whereas some metallic elements can cause adverse effects on the human body [6,7]. In this study, 17 finished tea samples consisted of 7 black bagged tea and 8 green tea samples analyzed for metal composition. A total of 21 metals including Na, K, Mg, Ca, Ba, Mn, Fe, Cu, Zn, Al, B, As, Sb, Pb, Se, Cr, Cd, Ni, Sn, Ge, Hg were determined in 17 sample tea products. These metals were analyzed by high frequency induction plasma emission spectrometry (ICP-OES) and atomic absorption spectrometry (AAS). Experimental results show that the metal content in tea is very diverse in all samples, in which potassium accounts for the highest content, followed by Ca, Mn, Mg, Al. Micronutrients such as Fe, Cu, Zn, Na are in the range of 10 to 200 mg/kg. No heavy metal such as As, Cr, Cd, Hg, Pb was found in bagged tea.


tea, element, heavy metal, ICP, AAS
Pages : 143-147

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