Determination of Metal Contents in Carrot and its Corresponding Soil of the Plant Cultivated in Akaki Kality Farms in Addis Ababa, Ethiopia by Flame Atomic Absorption Spectroscopy (FAAS)
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Date
2023-09-19
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Addis Ababa University
Abstract
The aim of this study is to determine the metal concentration of carrot and the corresponding soil sample collected from akaki kality farms in Addis Ababa, Ethiopia. Levels of selected metals (Fe, Cu, Ni, Zn, Pb and Cd) were determined using flame atomic absorption spectroscopy. After proper samples pre-treatment of washing, dried, crushed and homogenized, known weight of carrot sample was wet digested using 3:1 mL of HNO3, of HCl for 3:00 h at 300 oC and for soil sample 3:1 mL of HNO3 and of HCl and 1 mL for 3:00 hr at 300oC. Then using the optimized conditions sample preparation was made and levels of metals was determined by FAAS.
The mean concentration range (mg/kg) of each metal in carrot were Zn (52.30)> Cu (25.3)> Pb (25.18) >Fe (23.94) > Cd (2.43), Ni was below the detection limit and in soil samples Zn (134.46) > Cu (71.45) > Pb (22.18) >Cd (4.02), respectively. Ni and Fe were below the detection limit. The result indicates that concentration of Cd, Zn, Cu, Fe, and Pb metals in carrot sample and Cd, Zn, Cu, and Pb metals in its soil is higher than the WHO guidelines. ANOVA indicated that there is significant difference between the mean concentration of Cd Cu, and Zn and the mean concentration of the metal Pb does not significantly differ between the samples means among carrot and soil samples at 95% confidence level, respectively. The accuracy of the optimized procedure was evaluated by analysing the digestion of the spiked samples with standard solution and the percentage recoveries varied from 93.5 % to 101.6%.
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Carrot, Soil, Heavy Metals, Minerals, Digestion, Optimization, Flame Atomic Absorption Spectrometry