Determination of heavy metals content in tea leaves and products of their processing by method of inversion voltammetry

Azerbaijan State University of Economics, Baku, Azerbaijan

^* Corresponding author: maqerramovasevinc75@mail.ru

Abstract

This paper shows that some heavy metals generate free radicals that can lead to oxidative stress and cause other cellular damage, a carcinogenic effect, affecting a number of proteins. As a result of the measurement, it was found that in green tea leaves the content of concentrations of Zn, Cd, Pb, Cu is 2.90 ± 1.10; 0,029±0,029; 0.11 ± 0,040 and 3.10 ± 1.10 mg/kg, respectively. Their lowest content was found in drinks from black baikha tea - 0.039; 0,036±0,014; 0,044 ± 0,016 and 0,054 ± 0,020 mg/kg, respectively. Content of concentrations of Zn, Cd, Pb, Cu in tea extract with weight fraction of dry substances of 30.0% is 7.90- 9.59 times more than in beverages from black baikha tea. The mass concentration of toxic metals Cd, Pb in all analysed samples of tea leaves and tea drinks is less than their permissible levels specified in regulatory documents in force in the Republic of Azerbaijan.