Pollution Research Paper

Vol. 36, Issue 3, 2017; Page No.(513-519)

BIOACCUMULATION OF TOXIC AND ESSENTIAL MINERAL ELEMENTS CONTENT OF ASSAM TEA

PRANJAL TAMULY AND ARUNDHUTI DEVI

Abstract

Tea samples were collected from the factories of five reputed tea gardens located in Upper Assam India, namely Socklatinga T.E.(T1), Negheriting T.E.(T2), Rangamatty T.E.(T3), Borchapori Tea Estate(T4), Badulipara Tea Estate(T5) and analyzed the concentrations of toxic and essential mineral elements content viz. Cu, Ni, Zn, Fe, Cd, Mn, Mg, Co, Pb and V by using AAS. Among the toxic metals, Pb and V have been observed in below detectable limit (BDL). Ni is ranging from 0.9-5.92 mg/kg followed by Cr 0.66-2.0 mg/kg. Cd is ranging from BDL-0.1 mg/kg. Most abundant essential trace metal is Mg (142.8-166.4 mg/kg) followed by Mn (62.4- 117.5 mg/kg), Fe (31.1-83.5 mg/kg). Zn was ranging from 4.0-8.12 mg/kg, Cu 3.0-9.31 mg/kg and Co BDL-0.4 mg/kg. Determination of percentage transfer of heavy metals from tea to its infusion was also attempted. Fortunately, there is no any transfer of toxic metals Pb, Cd, Ni and Cr from tea to its infusion. In case of essential trace metals, the transfer to the infusion can be arranged in the descending order: Mg>Mn>Fe>Zne≥Cu. Calculated Hazard Quotient (HQ) and Hazard Index (HI) have established tea as a safe drink with no any adverse effect on health.

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