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Title: LEVELS OF ESSENTIAL AND NON-ESSENTIAL METALS IN LEAVES OF THE TEA PLANT (Camellia sinensis L.) AND SOILS OF WUSHWUSH FARMS, ETHIOPIA
Authors: Michael, Yemane
Advisors: Prof. B. S. CHANDRAVANSHI
Dr. TADDESE WONDIMU
Keywords: Tea clones
Tea leaves
Macronutrients
Micronutrients
Toxic metals
Organic matter
Atomic absorption
flame emission
spectroscopy
Copyright: 2006
Date Added: 3-Dec-2007
Publisher: Addis Ababa University
Abstract: Five tea clones of the C. assamica variety grown in Wushwush tea plantation farms, Ethiopia were analyzed for their contents of essential, non-essential and toxic metals (K, Ca, Mg, Fe, Mn, Cu, Zn, Na, Cd and Pb) by atomic absorption flame emission spectroscopy. Among the macronutrient metals, K was the most abundant element in the tea leaves and soils. Both the tea leaves and the soils showed similar accumulation pattern in their contents of the studied macronutrients. Mn was the predominant micronutrient heavy metal in the tea leaves tissue. Level of Fe in the leaf tissue was found to be the second abundant micronutrient next to Mn whereas concentrations of Cu and Co were relatively lower both in the soil and tea samples. Fortunately, the toxic heavy metals Pb and Cd in the leaf tissues were too low to be detected by the analytical technique used in this study. The soils were observed to be acidic (pH 5.04 - 5.49) with high organic matter (5.48 - 6.02%). Fe was the most abundant metal followed by Mn, Na and Zn in the soils. Unlike the tea leaves, the soils were found to contain the toxic metal, Cd (0.02 - 1.10 mg/kg). The levels of most of the metals determined in this study compared well with those reported for tea leaves from some other parts of the world.
Description: A Graduate Project (Chem. 774) Submitted to the School of Graduate Studies of Addis Ababa University
URI: http://hdl.handle.net/123456789/307
Appears in:Thesis - Chemistry

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