Determination of Some Selected Metals in Peanut (Arachis Hypogaea L.) Seed Samples Collected From three Different Areas of Ethiopia Using Flame Atomic Absorption Spectrophotometry (Faas)
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Date
2020-07-07
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Addis Ababa University
Abstract
Peanut (Arachis hypogaea L.) is an important legume oilseed. Peanut is mainly used to make
oils and can be consumed directly (roasted and salted) or processed into oil or cake. Peanut is
nutrient rich source of protein, fat, vitamin and minerals. The main objective of this study was to
determine some selected metals in peanut seeds cultivated in three different areas in Ethiopia.
The peanut seed samples were collected from Babile (Oromia region), Dibate (Benishangul
Gumuz region) and Zala Mela (SNNP) of Ethiopia. After the pretreatment, the samples were
digested for optimized volume of reagent, temperature and time. FAAS was used to determine the
metals. The accuracy of the optimized procedure was evaluated by analyzing the digestion of
spiked samples with standard solution and percentage recoveries varied from 90.5 to 98. The
concentration of metals in peanut seed samples were in the following range. Ca (48.4-83.4), Fe
(9.3-11.3), Mn (3.15-7.3), Na (784.7-1146), Pb (1.59-1.96) and Zn (12.2-19.3) mg/kg,
respectively. The concentration of Cd, Cu and Ni is below detection limit. ANOVA indicated that
there is no significant difference between the mean concentrations of Fe among the peanut seed
samples at 95% confidence. There is good correlation between Na-Ca, Mn-Na, Fe-Ca, Mn-Ca
and Mn-Fe. Poor correlations were observed between Fe-Zn, Mn-Zn, Pb-Fe and Zn-Ca.
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Keywords
Peanut (Arachis Hypogaea L.), Ethiopia, Faas